This video was made by the University of Utah Brain Institute to teach medical students about what a brain looks and feels like before it gets preserved in formalin and takes on the texture of a hard rubber ball.
The big takeaway message: Your brain is seriously squishy. So squishy, in fact, that a finger can dent it. As professor Suzanne Stensaas explains, this is one of the reasons why cerebrospinal fluid is so important. Your brain has to float in that fluid. If it didn't, it would come to rest against the side of your hard skull and quickly end up deformed.
Seriously, this is a fascinating (if extremely graphic) video. (Hilariously, given that fact, it opens with an image of a student eating.) Definitely worth watching!
Can you properly distinguish between a male and female crocodile? This research paper, published in 2007, will help — pointing out the sometimes subtle differences between external genitalia. It's chock full of pictures of erect crocodile penises, so you'll learn what those look like, but what particularly interested me was the diagram above.
Cloacas are sort of multi-purpose orifices found in certain species of birds and reptiles. Instead of having separate biological tools for poop, pee, and sex, these animals manage all three functions with the same hole. Males also have cloacas and will either have a penis or pseudo-penis that comes out of it for mating. I've known this for a long time, but had a lot of trouble picturing how all of that anatomy fits together. This diagram (Figure 4 in the paper) is the first image that made the internal structure of cloacas really make sense to me. The more you know!
Earlier this week, Republican representative Devin Nunes referred to his colleagues in the US House of Representatives as "lemmings with suicide vests". I would like to propose that this characterization is vastly unfair. To the lemmings.
That's because real lemmings, such as the adorable little creature pictured above, aren't actually suicidal. If anything, their problem is that they're just too damn horny. [Insert new political analogy here.]
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Wait But Why has a fantastic series of graphs that aim to help us wrap our heads around the enormous timescales on which forces like history, biology, geography and astronomy operate. By carefully building up graphs that show the relationship between longer and longer timescales, the series provides a moment's worth of emotional understanding of the otherwise incomprehensible. Read the rest
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Science journalist John Rennie is an amazing story teller. In this recording from Story Collider, he explains how he became the lab safety officer in his post-undergrad biology laboratory in the early 1980s (it involves being the only person who was concerned when other people started scooping up mercury with their bare hands). The peak of his experience: The day he stuck his arm, up past the elbow, into a barrel of liquid nitrogen. Good times.
Valérie Choumet at Paris's Institut Pasteur anaesthetized a mouse, stuck a microscope in a flap of its skin, and induced a mosquito to bite it. The result is the best footage yet of the weird, flexible, questing mouth of a mosquito, which can bend and twist and fork as it seeks out blood vessels.
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What is a species? That's not a simple question.
And it's even harder to answer after you've had a few.
Intrepid science journalist Charles Q. Choi takes inspiration from both the Drunk History series of videos and a really awful lot of whiskey to try and help you better understand a scientific concept (and also the finer points of orc biology). This was an idea I had, which came together with the help of several science journalist friends during the Science Online conference back in January. I'm still impressed with how accurate Charles was on the science while in that state. I can't speak to the Tolkien mythology.
Video Link (Note: This seems to play softly on some computers. If you're having trouble hearing it, plug in headphones or turn up your speakers.)
Thanks to Rose Eveleth, Colin Schultz, and Jennifer Honn — whose work on editing and producing this video was invaluable. Also thanks to John Rennie, Steve Ashley, Olivia Koski, Maki Naro, and Stephen Granade — whose input and assistance made this possible. And, of course, special thanks to Charles, who really was fully recovered by the next morning.