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The perilous world of banana slug sex

Banana slugs are hermaphrodites. Every slug has both a penis (which pops out of a pore on its head, like you do) and a vagina. Or, rather, every slug should have a penis. The truth is that quite a few of them don't and the story behind that discrepancy is rather strange and horrifying. Since there's little I love more than strange and horrifying stories from nature, you get to hear all about it.

At The Last Word On Nothing, Cassandra Willyard tells the story of a nearly 100-year-old effort by scientists to understand why some banana slugs appear to be missing their penises, or have penises that are stunted. We have known since 1916 how those penises came to be missing. Willyard describes the situation, which you can also watch in action in the video above:

Banana slugs begin their mating with a few vicious love nips. Then the animals curl around each other, forming a bright yellow yin-yang symbol. Next, they insert their penises. (Remember, they both have one.) In some cases, one slug provides sperm and the other slug receives it. More often, the slugs swap sperm. Copulation can last many hours. Then, in most cases, the slugs withdraw and part ways.

Heath caught a couple of slugs in the act. He noted the biting and the insertion. And then Heath observed something puzzling. As the slugs were withdrawing their penises, “one of the animals turned its head and commenced to gnaw upon the walls of the organ,” Heath wrote. The biting was “unusually vigorous,” he added, “and within a very few minutes the penis was entirely severed.”

The confusing part is why the hell they do this to each other.

Willyard says the best idea so far is that the penis eating represents a sort of sperm competition—a way of ensuring that the slug you just mated with isn't going to get a shot at mating with anybody else. But that's really just an educated guess.

What I like best about this story (besides the shock and awe) is that it handily illustrates one of the difficulties inherent in scientific research. In many cases, it's quite easy to answer the question, "What happens?" A century ago, scientists could easily observe and document the penis-eating behavior. All it took was somebody with sufficient interest in the question that they were willing to spend time watching many, many examples of slug sex.

But the "Why" is sometimes trickier.

Read the full story at The Last Word On Nothing

Video courtesy University of California Santa Cruz graduate student Brooke Miller. See more of her work on banana slug sex.

Also included: Some fun with Latin vocabulary. Did you know that dolichophallus means "long penis"? You're welcome.

Via Ed Yong

The business end of a sea urchin

How's this for an amusing case of photographic mis-identification? Call it "Dueling Disgustingness". Last week, New Scientist posted this lovely image of a blue-spotted sea urchin, taken by nature photographer David Fleetham.

New Scientist identified the photo as depicting said sea urchin in the process of expelling its own guts out of its mouth. Which, gross, but okay. That's reasonable. A surprising number of underwater animals eat in this manner, using the acids in their guts to dissolve prey before they actually slurp it up as a slurry.

But, at the Echinoblog, Smithsonian invertebrate zoology researcher Christopher Mah makes a compelling case against New Scientist's interpretation. That's not actually the sea urchin's mouth, says Mah. In fact, it's the opposite. That's a (rare) photo of a sea urchin taking a dump.

Mah has a lot of good photos that make his case quite well. You should check them out. Then, join me in contemplating this thought: If Mah is right, doesn't sea urchin poop look a lot like Dippin' Dots?

The New Scientist blog post—featuring lots of cool info about sea urchins

Christopher Mah's analysis of the photo, explaining why he thinks it shows a pooping sea urchin, rather than one that is eating something.

David Fleetham's website—for more (less disgusting) photos of nature

Via Scicurious

Cod hat

Check out this cod piece. Author William Gibson found it in Masset, BC, Canada. The head of a 145-pound cod, meant to be worn as a great helm. Nothing intimidates your enemies quite like wearing the head of a fish on your head.

EDIT: Mr. Gibson emailed to say that the photo comes from a local bed and breakfast ... "That thing is in the very excellent Copper Beech House bed & breakfast in Masset, BC, run by the Canadian poet Susan Musgrave. We're here because Doug Coupland recommended it, and it's awesome."

How to: Experience Manhattanhenge

Step 1, naturally, is to be in Manhattan.

I'm in New York City today and Scientific American contributing editor Steven Ashley was kind enough to reminded me that my visit is coinciding with Manhattanhenge—a twice-a-year event when the sun lines up with Manhattan's street grid. This year, there will be a Manhattanhenge on May 29/30 and another on July 11/12.

You'll note that Manhattanhenge does not actually occur on the same day as the solstice—when the Sun is at the highest point in the sky and the length of the day begins to get either longer (winter solstice) or shorter (summer solstice). That's because Manhattan's grid is rotated 30 degrees east off of true north, writes Neil deGrasse Tyson on the Hayden Planetarium website. That's enough to make Manhattanhenge less astronomically accurate than Stonehenge. But it's still awfully nifty and is supposed to look really, really cool.

Tonight's event should start around 8:17 pm (Eastern time, of course). Here's Neil deGrasse Tyson's advice on getting a good view:

For best effect, position yourself as far east in Manhattan as possible. But ensure that when you look west across the avenues you can still see New Jersey. Clear cross streets include 14th, 23rd, 34th. 42nd, 57th, and several streets adjacent to them. The Empire State building and the Chrysler building render 34th street and 42nd streets especially striking vistas.

Note that any city crossed by a rectangular grid can identify days where the setting Sun aligns with their streets. But a closer look at such cities around the world shows them to be less than ideal for this purpose. Beyond the grid you need a clear view to the horizon, as Manhattan has across the Hudson River to New Jersey. And tall buildings that line the streets create a vertical channel to frame the setting Sun, creating a striking photographic opportunity.

Read the rest at the Hayden Planetarium website

Check out some reader-submitted photos of Manhattanhenge that Xeni posted last year.

Image: Manhattanhenge 2011 | The Commuter, a Creative Commons Attribution (2.0) image from 59949757@N06's photostream

The secret world of swamp mud

Earlier this week, I showed you how scientists can use a simple, hand-operated tool to collect stratified core samples of mud at the bottom of a swamp. The deeper the samples go down, the older the mud is—until, eventually, you're looking at 6000-year-old muck, the remains of a lake bed that filled in with sediment and became swamp.

The core samples are narrow logs, each 50 cm long. (In all honesty, they looked like less-colorful versions of the 3 pound gummi worm I ordered for my 30th birthday party last year.) For the most part, they're some variation on the shade of brown, with occasional streaks of red and burnt umber, until you get to the very bottom. There, the samples turn grey. Put a bit in your mouth, as I was encouraged to do by Harvard Forest director David Foster, and you'll taste clay and feel grit between your teeth.

That's all well and good. But what do you do with core samples once you have them? For this installment of Dispatches From Harvard Forest I'm going to leave the woods and head into the lab, to see what happens to the parts of the Forest that scientists take home.

Step one: Make dirt cupcakes

Read the rest

A practical use for volcanic lightning (besides metal album covers)

Here's a story that combines two favorite bits of volcano news into one interesting discovery. You know those great, freaky photos of volcanic lightning? (In case you don't, I've got one posted above.) Remember how the Icelandic volcanic eruptions totally screwed up everybody's airplane travel plans?

Apparently, studying volcanic lightning could lead to better eruption detection systems that could make it easier to predict how big a plume of ash off that volcano will be—knowledge that can help airlines and travelers be better prepared. At Nature, Richard Monastersky reports:

The researchers found that the amount of lightning correlated with the height of the plume, something they could not test using more limited data collected during an eruption at Alaska’s Mount St Augustine in 2006. This observation is important, says Behnke, because systems to monitor lightning could provide an estimate for the size of an eruption, which is not always easy to assess for remote volcanoes.

During a previous eruption at Mount Redoubt in 1989 and 1990, for example, the size of the plume wasn’t known and a plane nearly crashed after passing through the ash cloud and temporarily losing all power from its engines. Behnke and her colleagues suggest that VHF stations similar to the ones they installed at Mount Redoubt could be used to monitor volcanoes to give early warning of an eruption and an estimate of its size.

Read the rest at Nature.com

Via Graham Farmelo

Image: Oliver Spalt via CC

How to: Collect 6,000-year-old swamp mud

Photo:Eric Niiler

I spent last weekend in the Harvard Forest, participating in hands-on science experiments as part of the Marine Biological Laboratory's science journalism fellowship. The goal was to give us an inside look at what, exactly, scientists actually do. When you're reading a peer-reviewed scientific research paper, where did all that data come from?

Sometimes, it comes from a swamp.

On Saturday, we walked into the Forest's Blackgum Swamp to take core samples out of the muck. There was no standing water in this swamp, at least not when we visited. But I wouldn't call the ground "solid", either. Instead, it was more like a moss-covered sponge. With every step, the ground beneath me would sink and smoosh. In some of the lower patches, that meant a shoe-full of water. In other spots, it was just a disconcerting sensation.

Taking core samples involves a little machine that's like a cross between a shovel and a straw. Made of heavy, solid metal, it has an extendable handle on one end. At the other, there's a hollow, cylindrical chamber that can be opened and closed by turning the handle counterclockwise. You drive the chamber into the ground, turn the handle, and then pull it back out. Once everything is back on the surface, you can open the chamber and see a perfect cylinder of earth, pulled up from below. That cylinder is removed from the chamber, wrapped in plastic wrap, labeled, and put in a long wooden box. Then you do all of that again, in 50 centimeter increments, until you hit stone. We got to about 475 centimeters—15 feet deep. By that point, you'll have collected 1000s of years of layered sediment.

This is not as easy as it sounds.

Read the rest

Destroying stuff for science

How do engineers know that the pillars supporting a bridge can withstand the force of thousands of cars driving over them for decades? How do we know what would happen to that bridge during an earthquake? What about an earthquake in winter?

Buildings, roads and bridges are all designed with a buffer of safety—basically, engineers round up on the numbers, a lot, and design these things to be far more sturdy than they actually have to be. But to make those decisions, they first have to know the physical limits of the materials they're working with. The best way to do that: Take a scaled version of a girder, pillar, or concrete slab and push it past the breaking point. Yes, this is, in fact, as awesome as it sounds.

The Constructed Facilities Laboratory at North Carolina State University is one of the places in the United States where this kind of research happens. In this lab, engineering researchers shake, bend, freeze, and crush the stuff that supports our world. I got to take a tour of this lab back in January, led by lab manager, Greg Lucier.

The videos here will take you through the 4500-square-foot lab and introduce you to the equipment these engineers use—from giant compression machines to something called a "Thermotron environmental chamber."

We'll start with a quick spin around the lab, just to get acquainted with the space. Then, you'll learn how some of the systems you see here work and why they're so important. Finally, you'll get to watch the lab in action.

Read the rest

A directory of wonderful sounds

Carnegie Mellon University's Auditory Lab has a huge collection of high-quality audio recordings of random sounds—from a marble dropped onto sheet metal, to bubble wrap being popped, to crumpling newspaper, to the sound of a sponge being squeezed out over empty tupperware. I trust you all will come up with fun uses for this stuff. At the Annals of Improbable Research you can hear one of the lab's sloshing sounds. It is a very good slosh. (Via Marc Abrahams) Maggie

64th Annual Conference on World Affairs in Boulder

Next week is one of my favorite times of the year, when I get inundated with smart people and interesting ideas, like some kind of geeky Christmas. For the second time, I'll be a speaker at the University of Colorado-Boulder's Conference on World Affairs (Mark will be there too!). The Conference is unlike anything I've been to anywhere else. It brings together artists, writers, musicians, scientists, politicians, journalists—a whole stew pot of interesting people—to talk about things that matter to them right now.

To create the panel topics, the organizers have all the speakers send in a list of things we can talk about at an expert level and things we just like to talk about. Then they use those lists to decide what subjects the conference will focus on. All the panels are free and open to the public. And they're all incredibly interactive. More than half the time at any panel is given over to audience Q&A.

Last year, I ended up talking about everything from comic books to the future of transportation. It's a blast, and I'll be posting some stories to BoingBoing next week about cool things that I learn watching some of the panels. But if you're in the Boulder area, you should really try to make it out. It's an event that truly captures the Happy Mutant spirit.

The panels I'll be speaking on next week.

The panels Mark will be speaking on next week.

Previously:

Beautiful photo of a volcanic eruption

Volcano Tungurahua in Ecuador erupts about every 90 years—it's a schedule the mountain has kept for 1300 years. This photo was taken by Patrick Taschler in 2006. (Via Astronomy Photo of the Day and Alexandra Witze)

LEGO robots in the laboratory

We've talked here before about the extremely important (and often-overlooked) DIY aspect of science. Scientists are makers. They have to be. The tools they need often aren't available any other way. Other times, the tools are available, but they're far more expensive than what you could construct out of your own ingenuity.

In this video, researchers at Cambridge build LEGO robots that automate time-consuming laboratory processes at a fraction of the cost of a "real" robot.

Video Link

Via Karyn Traphagen

Crowdfunding the hunt for habitable moons

We've talked before about scientists using Rockethub to fund basic laboratory research—stuff that's important, but not likely to lead immediately to new technologies or other marketable products.

It's often hard to find the funding necessary to support this kind of research, and crowd funding is a great way to leverage public interest in science. Better yet, there's now a whole crowd-funding website dedicated specifically to the sciences.

The video above explains one of the projects that's trying to raise money through Petridish right now. David Kipping is a Harvard postdoc and a NASA Carl Sagan fellow. He wants to conduct the first ever survey of exomoons—moons outside our solar system.

Partially, his research is about understanding the universe. Knowing more about exomoons will teach us a lot about how solar systems, in general, work. But it's also about that tickly, exciting possibility of life on other planets. As we all learned from watching Return of the Jedi, it is possible to have a habitable moon. So far, the search for habitable exoplanets hasn't taken moons into consideration. Kipping's study would change that. But to make it work, he needs to buy a supercomputer. And for that, he needs your help. Kipping is within $3500 of his goal and has 14 days left to go.

Read more about Kipping's project at Petridish

Find lots more scientific research that needs your support.

Video Link

Cocktail party science: Day 3 at AAAS 2012 (+ our short video interviews with science writers!)

Last week, Maggie went to the largest science conference in the Western Hemisphere for four days of wall-to-wall awesomeness. Every day, she learned amazing things, watching scientists from all over the world talk about their work. Check the bottom of each post to find links to earlier posts in this series!

One of my favorite parts of the American Association for the Advancement of Science conference happens at the end of each day, after the panel discussions are over and the convention floor has been locked down. That's when the parties start.

Now, obviously, everybody likes parties. But these are better than most. The AAAS parties are where a delightful mixture of scientists, journalists, academic journal editors, and university public relations officers gather to compare notes, talk shop, and tell each other about the awesome science they learned during the day.

I already mentioned how hard it is to decide which panels to see and which lectures to attend. At any given time there will be three-to-five different things you'd like to watch, all happening simultaneously. During the day, you're forced to choose. But at night, the parties are where you get the chance to learn about all the things you didn't get to see for yourself. You arrive, are handed a glass of wine, and all your friends run up to find out what you learned that day. It is a wonderful, nerd-tastic experience, and I want to share it with you.

On Sunday, February 19th, I took a small video recorder to a AAAS wine and cheese party. I found some people with neat stories to tell and convinced them to share those stories on camera. Together, these 11 short videos—none longer than 4 minutes or so—will give you a taste of what a AAAS party is like. It'll also give you an idea of just how many subjects AAAS covers. This video collection contains cool facts on every topic from dolphin rights, to GM crops, to international political intrigue. Just kick back, pour yourself a glass of wine, and ask, "So what did you see today?"

First up: Freelance journalist Neil Savage, who learned some fascinating stuff about the plethora of ways technology helps us gather information about ourselves—and how we might protect that information in the future.

Read the rest

A futurist prediction that came true

Sure, it's fun to post old pages of mid-century science magazines and make fun of the predictions that never came true—flying cars! Weather control!

But it's equally, if not more, enjoyable to read predictions for things that actually happened. These are the things that remind us that the world we live in today is pretty goddamn amazing. Teacher Michael Poser sent me one such prediction that he and his students found in The Science Year Book of 1947, a sort-of proto-aggregator that compiled reprints of stories in science magazines. This quote came from a Scientific American article entitled "Microwaves on the way":

In peacetime microwaves are slated for an even more spectacular career… Private phone calls by the hundreds of thousands sent simultaneously over the same wave band without wires, poles, or cables. Towns where each citizen has his own radio frequency, over which he can get voice, music, and television, and call any phone in the country by dialing. Complete abolition of static interference from electrical devices and from other stations. A hundred times as much “space on the air” as is now available in the commercial radio band. A high-definition and color-television network to cover the country. And, perhaps most important of all, a nationwide radar network to regulate all air traffic and furnish instantaneous visual weather reports to airfields throughout the land. By such a system, every aircraft over the United States or approaching it could be spotted, identified and shown simultaneously on screens all the way from Pensacola to Seattle.

What an awesome find! I don't know about you, but I pretty much take for granted all the things that short wavelength radio waves (i.e. microwaves) do for me every day. It's amazing to see something that has become so blase talked about like the wonder of technology it actually is.

Image: mercury m3 sunbury microwave mast, a Creative Commons Attribution Share-Alike (2.0) image from osde-info's photostream

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