In this YouTube video, a fellow runs 10 amps through a cylinder of pencil graphite, burning his fingers (accidentally on purpose, I'd say).
He has a good article about graphite on his site:
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Graphite is highly conductive unlike diamond or wood. But it is conductive along the layers, not perpendicular to them. It has many different applications. Generally it is crushed into powder that can be used to make other components like battery rods, deposited traces on electronics and such.
But pencils are the most basic use of them. If you draw a thick line using pencil on paper and measure the resistance across it, you will see your line is conductive, and if you bring your probes closer on the paper over the line, the resistance gets lower, like a potentiometer.
Maggie Koerth-Baker reports on the strange science of an experimental result decades in the making.
Pneumatic tube systems — little canisters shot through a series of tubes via the power of compressed air — have been around since the 19th century when they were briefly popular as a way to quickly deliver mail in big cities. Today, they're probably most familiar from their use in drive-through banking, but the tubes also turn up at libraries (the one at the main branch of the New York Public Library is particularly steampunky), in scientific laboratories, and in hospitals.
Last month, I spent an inordinate amount of time in one Minneapolis area hospital, waiting for an induced labor to kick in. How do you entertain yourself between the insertion of the IV line and the beginning of serious contractions? Turns out, you go on a lot of short walks, you watch some TV, and (if you're lucky) you convince the nurses to let your husband "mail" his cell phone from the labor/delivery department to the post-natal department, using the hospital's pneumatic tube system. Read the rest
Are you the kind of person who could lie in bed for 70 days for science? If so, you could make $18,000 in a NASA study of microgravity
. The catch (because lying on your back for 70 days wasn't already enough of a catch): The bed will be tilted 6 degrees towards your head, forcing bodily fluids upwards and replicating what happens to your cardiovascular system in microgravity environments. Read the rest
I'm loving the "Doing Stuff with Crazy Aunt Lindsey" series of hands-on science YouTube videos for kids. I can't find the host's full name on the YouTube page or her website, but she's a fantastic presence and so are the kids that appear with her. The result is a series of videos that are adorable, high-spirited, creative, and fun—full of great, simple projects that pack a surprising amount of science "oomph" behind them.
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GE hosted a contest to make super-short science videos for Vine and the results feature some really clever, nifty little clips.
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In fact, the Double Stuf Oreos tested by a high school math class
in Queensbury, N.Y. contained only 1.86x the amount of stuff that was in a regular Oreo. A Nabisco spokeswoman, responding to the scandal, says the measurements must have been inaccurate. Read the rest
Earlier this month, volcanologists blew 12 holes in an otherwise peaceful meadow in Ashford, New York
. It's not that they had anything against the meadow, per se, it's just that it was a convenient place to do some real-world experiments in how explosions affect the Earth and what we can do to monitor and predict volcanic eruptions. Read the rest
Science Buddies has an interesting, springtime-themed experiment in the chemistry of color that you can do at home, using plants you've gathered from your yard or a park. It looks like a great activity for curious folks of all ages
. Read the rest
This morning, Marketplace Tech Report had a story on a new cellulose-based building material that could be made by genetically engineered bacteria — altered versions of the bacteria that naturally make stuff like kombucha. This tech sounds like it's got a long way to go from laboratory to the real world, but if they can perfect the process and make it large enough quantities, what you'd end up with a strong, inexpensive goop that could be used to build everything from medical dressings, to digital paper, to spaceships. Yes, you could theoretically use this stuff to make rocket casings, according to R. Malcolm Brown, Jr.
, a professor of cell biology at UT Austin. And if you can build a rocket from this stuff, you could also break the same material back down into an edible, high-fiber foodstuff. Read the rest
For hand towels, astronauts get those little vacuum-packed pucks that you kind of have to unravel into a towel. But what happens when you actually put the towels to use?
Two Nova Scotia high school students, Kendra Lemke and Meredith Faulkner, submitted this experiment to Canadian Space Agency and got to see astronaut Chris Hadfield actually test it out on the ISS. The results are seriously extraordinary and you need to see them.
Thanks, Dean! Read the rest
Last week, I posted about a YouTuber who thinks his he might have tricked his cat with an optical illusion that's based on very human psychology. He asked other people to test the illusion on their cats
, just to get some more data points. Now, the psychologists who created the illusion have pitched in to help out
, posting a modified version that doesn't elicit the sensation of motion. Show your cat both versions and see whether it's the paper she's trying to kill, or the "rotating" circles. (Thanks to Diana Issidorides!) Read the rest
Medieval Europe is generally known for its animosity toward actually testing things out, favoring tradition over experimentation and earning a reputation as being soundly anti-science. In particular, it's easy to get the impression that nobody was doing human dissections at all, prior to the Renaissance. But it turns out that isn't true. In fact, some dissections were even prompted (not just condoned) by the Catholic Church
. The knowledge medieval dissectors learned from their experiments didn't get widely disseminated at the time, but their work offers some interesting insight into the development of science. The quest for knowledge in Europe didn't just appear out of nowhere in the 1400s and 1500s. Read the rest
Living on Mars time is making Katie Worth fat.
The journalist is attempting to live, on Earth, as if she's operating in a Martian time zone and blogging about the experience for Scientific American. On the 15th day of her experiment, she writes about how Mars time has changed her eating habits ... and made her drinking habits a whole lot sketchier-sounding. Read the rest
Messing with ants for fun (and scientific profit)
Now you can play Cyberball
— a computer game that psychology researchers use to study the effects of social ostracism and hurt feelings. Normally, the game is played by test subjects who are hooked up to some kind of brain scanning system and who are told that they are playing against other test subjects in other rooms. In reality, they (and now you!) are playing against a computer program that is designed to exclude you and make you feel unwelcome. Why would someone design such a thing? For science! Of course. (Via Rowan Hooper) Read the rest
The Joule Thief is a way of producing enough electricity to run small, but useful, electric lights using cast-off trash like pop-can tabs and "dead" batteries. It's especially handy in the Himalayas, writes inventor and Google Science Fair judge T.H. Culhane. There, electricity is a precious resource. But the components needed to build a Joule Thief are abundant, thanks to climbers and tourists who leave behind all sorts of surprisingly useful litter.
Last week, Culhane joined a G+ hangout sponsored by National Geographic and Girlstart to talk about the value in things we throw away and walk viewers through the construction of their very own Joule Thief. You can watched the video of the event, or read the instructions for building a Joule Thief at Culhane's blog.
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The fact that the Joule thief allows one to run a 3V LED from a 1.5 or 1.2 Volt battery would itself be astounding, because it means you only need half the number of batteries to get the same light.
Some of you are thinking "wait, maybe it enables you to use a single 1.5 volt battery to light a 3V LED instead of the usual two, but doesn't it just make that battery last half as long? Great question, but the answer is that the Joule Thief, which works by building up and collapsing a magnetic field around the torus (which acts as an electromagnetic inductor) actually is more efficient than using a battery directly because it PULSES the energy to the LED.