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	<title>Comments on: Time traveler&#039;s cheat&#160;sheet</title>
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	<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html</link>
	<description>Brain candy for Happy Mutants</description>
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	<item>
		<title>By: rawdiant</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-687110</link>
		<dc:creator>rawdiant</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-687110</guid>
		<description>A few took issue at my suggestion that diebetes can be profoundly treated via diet. I guess I gave a secondary source for that instead of a primary one. Instead of googling &quot;reversing diabetes naturally,&quot; google the work of Dr. Gabriel Cousens. He&#039;s an M.D. in Arizona and has written many amazing books on nutrition, including a few focused on his research into treating diabetes. The secondary source was a web site that promotes a documentary called &quot;Simply Raw&quot; in which they took a group of diabetics and put them on a special raw foods protocol, then showed the (amazing) results after 30 days. 

@DarwinSurvivor Yes, I know the difference. I just wanted to keep my comments brief. For the long explanation, check out Dr. Cousen&#039;s research. I think it&#039;s incredibly inspiring. 

@teufelsdroch Don&#039;t know exactly what you&#039;re saying to me, but I&#039;m *proudly* not mainstream medical. If someone uses that as a &quot;counter-argument&quot; against my ideas, that&#039;s their problem, not mine. I&#039;m here neither to argue nor to proselytize. Just sharing opinions like everyone else.</description>
		<content:encoded><![CDATA[<p>A few took issue at my suggestion that diebetes can be profoundly treated via diet. I guess I gave a secondary source for that instead of a primary one. Instead of googling &#8220;reversing diabetes naturally,&#8221; google the work of Dr. Gabriel Cousens. He&#8217;s an M.D. in Arizona and has written many amazing books on nutrition, including a few focused on his research into treating diabetes. The secondary source was a web site that promotes a documentary called &#8220;Simply Raw&#8221; in which they took a group of diabetics and put them on a special raw foods protocol, then showed the (amazing) results after 30 days. </p>
<p>@DarwinSurvivor Yes, I know the difference. I just wanted to keep my comments brief. For the long explanation, check out Dr. Cousen&#8217;s research. I think it&#8217;s incredibly inspiring. </p>
<p>@teufelsdroch Don&#8217;t know exactly what you&#8217;re saying to me, but I&#8217;m *proudly* not mainstream medical. If someone uses that as a &#8220;counter-argument&#8221; against my ideas, that&#8217;s their problem, not mine. I&#8217;m here neither to argue nor to proselytize. Just sharing opinions like everyone else.</p>
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	<item>
		<title>By: Felton</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686605</link>
		<dc:creator>Felton</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686605</guid>
		<description>Good God, people!  Hasn&#039;t &lt;i&gt;Back to the Future&lt;/i&gt; taught us what a bad idea this is?!
</description>
		<content:encoded><![CDATA[<p>Good God, people!  Hasn&#8217;t <i>Back to the Future</i> taught us what a bad idea this is?!</p>
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	<item>
		<title>By: glory bee</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686612</link>
		<dc:creator>glory bee</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686612</guid>
		<description>I have never fantasised being, say, in the Middle Ages or before. People need to know the truth of living in the past. Highwaymen were thugs, people stank and the Church held too much influence and dealt in FEAR. And my sister would not have survived her eye infection due to lack of penicillin.</description>
		<content:encoded><![CDATA[<p>I have never fantasised being, say, in the Middle Ages or before. People need to know the truth of living in the past. Highwaymen were thugs, people stank and the Church held too much influence and dealt in FEAR. And my sister would not have survived her eye infection due to lack of penicillin.</p>
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		<title>By: nanuq</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686617</link>
		<dc:creator>nanuq</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686617</guid>
		<description>You should make sure your cheat sheet is fireproof since you&#039;ll probably end up being burned as a witch.
</description>
		<content:encoded><![CDATA[<p>You should make sure your cheat sheet is fireproof since you&#8217;ll probably end up being burned as a witch.</p>
]]></content:encoded>
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	<item>
		<title>By: DarwinSurvivor</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686874</link>
		<dc:creator>DarwinSurvivor</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686874</guid>
		<description>I don&#039;t think you know the difference between type1 and type2 diabetes.

Type 1 (Insulin Injections): Body does NOT generate insulin. This is caused by a deficiency or failure of the pancreas. Injections are required and while a proper diet will help, it will NOT remove your insulin dependency.

Type 2 (Pill/Diet Controlled): Body does not use insulin properly, this is normally controlled by a pill that helps the body use it&#039;s own insulin. Not only can obesity be a cause for 

Type 2 diabetes, but a proper diet and weight loss can actually reverse the condition.


My father as Type 1 Diabetes and while there are some experimental procedures being worked on, there is currently NO cure. Until there is a medical breakthrough, Type 1 Diabetes sufferers will Please do not give medical advice about conditions you are only familiar with from random googling.

More Info: http://en.wikipedia.org/wiki/Diabetes_mellitus</description>
		<content:encoded><![CDATA[<p>I don&#8217;t think you know the difference between type1 and type2 diabetes.</p>
<p>Type 1 (Insulin Injections): Body does NOT generate insulin. This is caused by a deficiency or failure of the pancreas. Injections are required and while a proper diet will help, it will NOT remove your insulin dependency.</p>
<p>Type 2 (Pill/Diet Controlled): Body does not use insulin properly, this is normally controlled by a pill that helps the body use it&#8217;s own insulin. Not only can obesity be a cause for </p>
<p>Type 2 diabetes, but a proper diet and weight loss can actually reverse the condition.</p>
<p>My father as Type 1 Diabetes and while there are some experimental procedures being worked on, there is currently NO cure. Until there is a medical breakthrough, Type 1 Diabetes sufferers will Please do not give medical advice about conditions you are only familiar with from random googling.</p>
<p>More Info: <a href="http://en.wikipedia.org/wiki/Diabetes_mellitus" rel="nofollow">http://en.wikipedia.org/wiki/Diabetes_mellitus</a></p>
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	<item>
		<title>By: calvert4096</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686879</link>
		<dc:creator>calvert4096</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686879</guid>
		<description>Holy crap, this guy read my mind.  I&#039;m always thinking about this stuff, and half the time this is why I&#039;m on wikipedia.  I suppose this could also serve as T3H OFFICIAL CIVILIZATION REBOOT MANUAL in case of a zombie apocalypse or something.  I&#039;m also pleased at least one of you mentioned soap-making.  How to make cement, the Watt steam engine and subsequently the internal combustion engine (which is arguably a greater obstacle to flight than understanding the finer details of aerodynamics), and the Bessemer process for making steel would also be useful additions. </description>
		<content:encoded><![CDATA[<p>Holy crap, this guy read my mind.  I&#8217;m always thinking about this stuff, and half the time this is why I&#8217;m on wikipedia.  I suppose this could also serve as T3H OFFICIAL CIVILIZATION REBOOT MANUAL in case of a zombie apocalypse or something.  I&#8217;m also pleased at least one of you mentioned soap-making.  How to make cement, the Watt steam engine and subsequently the internal combustion engine (which is arguably a greater obstacle to flight than understanding the finer details of aerodynamics), and the Bessemer process for making steel would also be useful additions. </p>
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	<item>
		<title>By: Anonymous</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686627</link>
		<dc:creator>Anonymous</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686627</guid>
		<description>Pressure is related to the normal force you are talking about--and the slower moving air exerts a larger force than the faster moving air. The boundary layer is not mentioned either, but we have to leave some intrigue for future scientists. Don&#039;t every brilliant mind there ever was just because you&#039;ve mastered space-time.</description>
		<content:encoded><![CDATA[<p>Pressure is related to the normal force you are talking about&#8211;and the slower moving air exerts a larger force than the faster moving air. The boundary layer is not mentioned either, but we have to leave some intrigue for future scientists. Don&#8217;t every brilliant mind there ever was just because you&#8217;ve mastered space-time.</p>
]]></content:encoded>
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	<item>
		<title>By: mmrtnt</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-688938</link>
		<dc:creator>mmrtnt</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-688938</guid>
		<description>Years ago, I put together this handy guide:

http://botaday.blogspot.com/2006/03/what-i-know-about-time-travel.html</description>
		<content:encoded><![CDATA[<p>Years ago, I put together this handy guide:</p>
<p><a href="http://botaday.blogspot.com/2006/03/what-i-know-about-time-travel.html" rel="nofollow">http://botaday.blogspot.com/2006/03/what-i-know-about-time-travel.html</a></p>
]]></content:encoded>
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	<item>
		<title>By: ikegently</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686635</link>
		<dc:creator>ikegently</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686635</guid>
		<description>some of the popes are evil!</description>
		<content:encoded><![CDATA[<p>some of the popes are evil!</p>
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	<item>
		<title>By: Teller</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686636</link>
		<dc:creator>Teller</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686636</guid>
		<description>Great idea, Ryan. Well done. Okay got that over with. Issue with the longitude and London blurb. Sailors were already doing the London-time thing. Trouble was roiling seas upset the accuracy of shipboard clocks. That big prize was to find a clock whose inner movement was unperturbed by sea movement - the chronometer.  </description>
		<content:encoded><![CDATA[<p>Great idea, Ryan. Well done. Okay got that over with. Issue with the longitude and London blurb. Sailors were already doing the London-time thing. Trouble was roiling seas upset the accuracy of shipboard clocks. That big prize was to find a clock whose inner movement was unperturbed by sea movement &#8211; the chronometer.  </p>
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	<item>
		<title>By: djn</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686892</link>
		<dc:creator>djn</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686892</guid>
		<description>@Uncle_Max, 49:
I refer you to the relevant &lt;a href=&quot;http://www.viruscomix.com/page382.html&quot;&gt;Subnormality&lt;/a&gt; strip.</description>
		<content:encoded><![CDATA[<p>@Uncle_Max, 49:<br />
I refer you to the relevant <a href="http://www.viruscomix.com/page382.html">Subnormality</a> strip.</p>
]]></content:encoded>
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	<item>
		<title>By: Anonymous</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686640</link>
		<dc:creator>Anonymous</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686640</guid>
		<description>I have the T-shirt. So far the only person to compliment me was a Target cashier.

I&#039;ll show you all!</description>
		<content:encoded><![CDATA[<p>I have the T-shirt. So far the only person to compliment me was a Target cashier.</p>
<p>I&#8217;ll show you all!</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: 13tales</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686642</link>
		<dc:creator>13tales</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686642</guid>
		<description>Note to self: have this tattooed upside-down on my stomach.</description>
		<content:encoded><![CDATA[<p>Note to self: have this tattooed upside-down on my stomach.</p>
]]></content:encoded>
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	<item>
		<title>By: lucieperrie</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686908</link>
		<dc:creator>lucieperrie</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686908</guid>
		<description>Everyone kills Hitler on their first trip. 

http://www.abyssandapex.com/200710-wikihistory.html</description>
		<content:encoded><![CDATA[<p>Everyone kills Hitler on their first trip. </p>
<p><a href="http://www.abyssandapex.com/200710-wikihistory.html" rel="nofollow">http://www.abyssandapex.com/200710-wikihistory.html</a></p>
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	<item>
		<title>By: jfrancis</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686663</link>
		<dc:creator>jfrancis</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686663</guid>
		<description>Man, I wish I had had this sooner.

oh, wait! : )</description>
		<content:encoded><![CDATA[<p>Man, I wish I had had this sooner.</p>
<p>oh, wait! : )</p>
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	<item>
		<title>By: teufelsdroch</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686674</link>
		<dc:creator>teufelsdroch</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686674</guid>
		<description>Wow! Yes, I have wasted many hours thinking about time travel and gunpowder does rise to the top. I love that flight gets top honors--but if you&#039;re gonna mention nuclear power it&#039;s not like you&#039;re avoiding military applications as a matter of principal. 

Remember--every genius gets hired by the military first!

What&#039;s even better is how &lt;A href=&quot;http://en.wikipedia.org/wiki/Potassium_nitrate&quot;&gt;saltpeter&lt;/A&gt; is made from &lt;A href=&quot;http://www.fryingcolors.com/saltpeter.html&quot;&gt; urine&lt;/A&gt;. Both a colorful story and a hugely important discovery. I am unrepentant that I have spent many hours fantasizing about how pissing on a heap of cow manure could have changed the world.</description>
		<content:encoded><![CDATA[<p>Wow! Yes, I have wasted many hours thinking about time travel and gunpowder does rise to the top. I love that flight gets top honors&#8211;but if you&#8217;re gonna mention nuclear power it&#8217;s not like you&#8217;re avoiding military applications as a matter of principal. </p>
<p>Remember&#8211;every genius gets hired by the military first!</p>
<p>What&#8217;s even better is how <a href="http://en.wikipedia.org/wiki/Potassium_nitrate">saltpeter</a> is made from <a href="http://www.fryingcolors.com/saltpeter.html"> urine</a>. Both a colorful story and a hugely important discovery. I am unrepentant that I have spent many hours fantasizing about how pissing on a heap of cow manure could have changed the world.</p>
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	<item>
		<title>By: imag</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686683</link>
		<dc:creator>imag</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686683</guid>
		<description>If you go back in time, aren&#039;t you almost certain to end up in empty space?  

Going back in time could be easy, but maintaining your position relative to the earth, sun, solar system, galaxy, etc. seems much more difficult.

In other words, never step foot in a time machine, even if you know (especially if you know!) it works... unless it&#039;s a Delorean of course.</description>
		<content:encoded><![CDATA[<p>If you go back in time, aren&#8217;t you almost certain to end up in empty space?  </p>
<p>Going back in time could be easy, but maintaining your position relative to the earth, sun, solar system, galaxy, etc. seems much more difficult.</p>
<p>In other words, never step foot in a time machine, even if you know (especially if you know!) it works&#8230; unless it&#8217;s a Delorean of course.</p>
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	<item>
		<title>By: fusillijerry</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686687</link>
		<dc:creator>fusillijerry</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686687</guid>
		<description>If you get a Tshirt, can you get the text printed upside down so you can read it when you are time-traveling?</description>
		<content:encoded><![CDATA[<p>If you get a Tshirt, can you get the text printed upside down so you can read it when you are time-traveling?</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Anonymous</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-687711</link>
		<dc:creator>Anonymous</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-687711</guid>
		<description>polaris is not the brightest star...just fyi.</description>
		<content:encoded><![CDATA[<p>polaris is not the brightest star&#8230;just fyi.</p>
]]></content:encoded>
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	<item>
		<title>By: Bearclaw</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686436</link>
		<dc:creator>Bearclaw</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686436</guid>
		<description>This was made by Ryan North of Dinosaur Comics (Qwantz.com). Or, at least, it&#039;s been sold by him for almost a year now.

Please give credit where it is due.</description>
		<content:encoded><![CDATA[<p>This was made by Ryan North of Dinosaur Comics (Qwantz.com). Or, at least, it&#8217;s been sold by him for almost a year now.</p>
<p>Please give credit where it is due.</p>
]]></content:encoded>
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	<item>
		<title>By: teufelsdroch</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686692</link>
		<dc:creator>teufelsdroch</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686692</guid>
		<description>&quot;I&#039;m just not a mainstream guy when it comes to health.&quot;

Sweet. Start with that, and everything you say is a useful counter-argument. Start with your actual beliefs and you&#039;re not that different from &lt;A href=&quot;http://en.wikipedia.org/wiki/Christian_Science&quot;&gt;a christian scientist&lt;/A&gt;. 

Incidentally, if a doctor talks about &lt;A href=&quot;http://www.know-vaccines.org/autism.html&quot;&gt;the whole vaccine conspiracy&lt;/A&gt; it is now &lt;A href=&quot;http://www.webmd.com/brain/autism/news/20090212/vaccine-court-rejects-autism-claims?ecd=wnl_nal_021209&quot;&gt;officially legal malpractice&lt;/A&gt;. It is illegal for a doctor to suggest that vaccines are linked to autism (or insert your wacko idea here).

However, as long as your beliefs selectively creep into the mainstream where they hold, I&#039;m totally happy and agree you&#039;re doing a public service.</description>
		<content:encoded><![CDATA[<p>&#8220;I&#8217;m just not a mainstream guy when it comes to health.&#8221;</p>
<p>Sweet. Start with that, and everything you say is a useful counter-argument. Start with your actual beliefs and you&#8217;re not that different from <a href="http://en.wikipedia.org/wiki/Christian_Science">a christian scientist</a>. </p>
<p>Incidentally, if a doctor talks about <a href="http://www.know-vaccines.org/autism.html">the whole vaccine conspiracy</a> it is now <a href="http://www.webmd.com/brain/autism/news/20090212/vaccine-court-rejects-autism-claims?ecd=wnl_nal_021209">officially legal malpractice</a>. It is illegal for a doctor to suggest that vaccines are linked to autism (or insert your wacko idea here).</p>
<p>However, as long as your beliefs selectively creep into the mainstream where they hold, I&#8217;m totally happy and agree you&#8217;re doing a public service.</p>
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	<item>
		<title>By: Xenu</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686438</link>
		<dc:creator>Xenu</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686438</guid>
		<description>It&#039;s a good start, but they left out reminding me which stocks to invest in, which lotto numbers to pick, and which sporting events to bet on.</description>
		<content:encoded><![CDATA[<p>It&#8217;s a good start, but they left out reminding me which stocks to invest in, which lotto numbers to pick, and which sporting events to bet on.</p>
]]></content:encoded>
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	<item>
		<title>By: Phikus</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686439</link>
		<dc:creator>Phikus</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686439</guid>
		<description>Damn.  There goes our version of recorded history...</description>
		<content:encoded><![CDATA[<p>Damn.  There goes our version of recorded history&#8230;</p>
]]></content:encoded>
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	<item>
		<title>By: fusillijerry</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686695</link>
		<dc:creator>fusillijerry</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686695</guid>
		<description>&quot;Conneticutt Yankee in King Arthur&#039;s Court&quot; by Mark Twain hooked me on this kind of stuff when I was a kid.  To be honest, I read the &quot;Classics Illustrated&quot; version.

Thanks to you, I just ordered &quot;1632&quot; from Amazon.</description>
		<content:encoded><![CDATA[<p>&#8220;Conneticutt Yankee in King Arthur&#8217;s Court&#8221; by Mark Twain hooked me on this kind of stuff when I was a kid.  To be honest, I read the &#8220;Classics Illustrated&#8221; version.</p>
<p>Thanks to you, I just ordered &#8220;1632&#8243; from Amazon.</p>
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		<title>By: SamSam</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-687975</link>
		<dc:creator>SamSam</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-687975</guid>
		<description>The explanation of the wing is &lt;i&gt;not&lt;/i&gt; actually &quot;dead wrong.&quot;

I know lots of people learned in high-school that the reason wing generate lift is because the top surface is longer, and so the air has to travel further to get to the end, and so it has to travel faster. Faster = low pressure, so Bernoulli etc.

Then everyone learned that this was wrong, and that just because the top is longer doesn&#039;t just by itself imply that the air has to move faster. Myth disproved. So far so good. 

But then everyone reads explanations of wings that involve air pressure and jump in and say &quot;wait! wrong! classic misconception, bozos!&quot;

But Bernoulli and air pressure are &lt;i&gt;still&lt;/i&gt; important concepts for airfoils.

A good part of the wing&#039;s lift comes from deflecting the air downwards. Yes. But the angle of attack, coupled with the airfoil shape, &lt;i&gt;does&lt;/i&gt; cause there to be higher pressure on the bottom surface of the wing than the top.

The angle of attack causes the air below the wing to &quot;bunch up&quot; beneath it (because it&#039;s hitting the underside). The airfoil shape, in turn, causes the top surface to spill up &lt;i&gt;above&lt;/i&gt; the surface of the wing. This then causes a low pressure &quot;gap&quot; above the wing. This difference in pressure provides a second upward force.

&lt;a href=&quot;http://warp.povusers.org/grrr/airfoilmyth.html&quot;&gt;Here&#039;s a good website&lt;/a&gt; that shows the myths of the commonly taught wing theory, and it&#039;s these myths that everyone is thinking of when they shout &quot;wait!&quot; But you&#039;ll note that the &quot;correct&quot; explanation is entirely consistent with Ryan&#039;s diagram and description. Ryan just happens to omit the second reason for lift, the downward-deflected air.</description>
		<content:encoded><![CDATA[<p>The explanation of the wing is <i>not</i> actually &#8220;dead wrong.&#8221;</p>
<p>I know lots of people learned in high-school that the reason wing generate lift is because the top surface is longer, and so the air has to travel further to get to the end, and so it has to travel faster. Faster = low pressure, so Bernoulli etc.</p>
<p>Then everyone learned that this was wrong, and that just because the top is longer doesn&#8217;t just by itself imply that the air has to move faster. Myth disproved. So far so good. </p>
<p>But then everyone reads explanations of wings that involve air pressure and jump in and say &#8220;wait! wrong! classic misconception, bozos!&#8221;</p>
<p>But Bernoulli and air pressure are <i>still</i> important concepts for airfoils.</p>
<p>A good part of the wing&#8217;s lift comes from deflecting the air downwards. Yes. But the angle of attack, coupled with the airfoil shape, <i>does</i> cause there to be higher pressure on the bottom surface of the wing than the top.</p>
<p>The angle of attack causes the air below the wing to &#8220;bunch up&#8221; beneath it (because it&#8217;s hitting the underside). The airfoil shape, in turn, causes the top surface to spill up <i>above</i> the surface of the wing. This then causes a low pressure &#8220;gap&#8221; above the wing. This difference in pressure provides a second upward force.</p>
<p><a href="http://warp.povusers.org/grrr/airfoilmyth.html">Here&#8217;s a good website</a> that shows the myths of the commonly taught wing theory, and it&#8217;s these myths that everyone is thinking of when they shout &#8220;wait!&#8221; But you&#8217;ll note that the &#8220;correct&#8221; explanation is entirely consistent with Ryan&#8217;s diagram and description. Ryan just happens to omit the second reason for lift, the downward-deflected air.</p>
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		<title>By: hinges</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686441</link>
		<dc:creator>hinges</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686441</guid>
		<description>I think it should be noted that this is the work of the reliably excellent Ryan North of &lt;a href=&quot;http://www.qwantz.com/&quot;&gt;Dinosaur Comics&lt;/a&gt;.</description>
		<content:encoded><![CDATA[<p>I think it should be noted that this is the work of the reliably excellent Ryan North of <a href="http://www.qwantz.com/">Dinosaur Comics</a>.</p>
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		<title>By: Anonymous</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686697</link>
		<dc:creator>Anonymous</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686697</guid>
		<description>There primary problems with this argument is this: there is no justification for assuming that a fluid parcel traveling over the top of the wing is moving faster than one traveling under the wing - hence you cannot appeal to the Bernoulli eqn (move faster = lower pressure) for pressure guidance.  It&#039;s all related, of course, and there is no &quot;real&quot; simple explanation of lift, but streamline curvature explanation (Euler-n eqn) doesn&#039;t require any transit-time assumptions.</description>
		<content:encoded><![CDATA[<p>There primary problems with this argument is this: there is no justification for assuming that a fluid parcel traveling over the top of the wing is moving faster than one traveling under the wing &#8211; hence you cannot appeal to the Bernoulli eqn (move faster = lower pressure) for pressure guidance.  It&#8217;s all related, of course, and there is no &#8220;real&#8221; simple explanation of lift, but streamline curvature explanation (Euler-n eqn) doesn&#8217;t require any transit-time assumptions.</p>
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		<title>By: Gloria</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686442</link>
		<dc:creator>Gloria</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686442</guid>
		<description>Come on, no credit for Ryan North? </description>
		<content:encoded><![CDATA[<p>Come on, no credit for Ryan North? </p>
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		<title>By: fusillijerry</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686701</link>
		<dc:creator>fusillijerry</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686701</guid>
		<description>Type II, sometimes.  No diet will return the insulin producing cells my immune system killed. That website looks pretty scammy.</description>
		<content:encoded><![CDATA[<p>Type II, sometimes.  No diet will return the insulin producing cells my immune system killed. That website looks pretty scammy.</p>
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		<title>By: Anonymous</title>
		<link>http://boingboing.net/2010/01/13/time-travelers-cheat.html#comment-686957</link>
		<dc:creator>Anonymous</dc:creator>
		<pubDate>Wed, 30 Nov -0001 00:00:00 +0000</pubDate>
		<guid isPermaLink="false">#comment-686957</guid>
		<description>Reminds me a lot of the artist Paul Laffoley&#039;s work - or a good spoof of it.</description>
		<content:encoded><![CDATA[<p>Reminds me a lot of the artist Paul Laffoley&#8217;s work &#8211; or a good spoof of it.</p>
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