Adam Cole

On Monday, NASA started accepting applications for its new class of astronauts. Applying is simple: Just log in to USAjobs.gov, search for "astronaut," and upload your resume and references. The job description says "Frequent travel may be required."

Watch a scary movie and your skin crawls. Goose bumps have become so associated with fear that the word is synonymous with thrills and chills.

But what on earth does scary have do to with chicken-skin bumps? For a long time, it wasn't well understood.

When it comes to feats of speed and strength, Homo sapiens is a pretty pitiful species. The list of animals that can outsprint us is embarrassing. There's the cheetah, of course, but also horses, ostriches, greyhounds, grizzly bears, kangaroos, wild boars, even some house cats.

The Nobel Prize in medicine was awarded Monday to three scientists for their work on parasitic diseases.

William C. Campbell and Satoshi Omura were recognized for discovering a compound that effectively kills roundworm parasites. A Chinese scientist, Dr. Youyou Tu, won for her work in isolating a powerful drug in the 1970s to fight malaria.

Hundreds of you sent in questions for Skunk Bear's live conversation with three astronauts and NASA's chief scientist on Tuesday. Thanks! The most common question was: "What happens when you get your period in space?"

I didn't end up asking them this question because:

a) The question itself has a lot of historical baggage;
b) The answer is pretty boring.

But since people were genuinely curious, I decided to answer it here.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Transcript

DAVID GREENE, HOST:

In the history of life on Earth, evolutionary forces have pushed some species to become incredibly large. After most dinosaurs died off 66 million years ago, some mammals and marsupials grew bigger and bigger, taking the dinos' place.

Make Lava, Not War

Jun 25, 2015

The Man v. Horse Marathon starts out like a typical cross-country race. Hundreds of runners stream past the starting line, through the town of Llanwrtyd Wells and then up into the Welsh hills.

But 15 minutes later, a second set of competitors takes off. Fifty horses and their riders chase the runners up and down ridges, across streams, and past hundreds of bewildered sheep.

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