This week in science: The fluid dynamics of crowds, a bird fossil and morning mindsets NPR's Ailsa Chang talks with Emily Kwong and Regina Barber of Short Wave about the fluid dynamics of crowds, an early fossil of a modern bird and new data on how people's moods change through the day. Regina Barber
NASA instructs employees to remove pronouns from all work communications An email seen by NPR says the move is to comply with a presidential order to "restore biological truth" to the government. Geoff Brumfiel
Spinal stimulation restored muscles wasted by rare genetic disorder Three patients with spinal muscular atrophy had improved muscle strength and could walk farther after a month of daily spinal stimulation. Jon Hamilton
Don't give a hoot about sports? The Superb Owl might be for you What began as an accidental misspelling or an online joke has soared into a cultural phenomenon. Joe Hernandez
Why polar bear fur doesn't freeze New research finds that grease that coats polar bear fur contains a specialized mixture of chemicals that make it resistant to freezing. Jonathan Lambert
A sense of foreboding hangs over the National Institutes of Health There's widespread confusion and fear among scientists and doctors on the sprawling National Institutes of Health campus and at institutions dependent on the agency's funding. Rob Stein
A man was sentenced to 475 years for dogfighting. The sport is surprisingly prevalent A man who was arrested with over 100 dogs and equipment at his Georgia home got the maximum sentence last week. Prosecutors hope it sheds light on the prevalence of dogfighting, a felony in the U.S. Rachel Treisman
The moon's grand canyons were carved in the blink of an eye The Earth's Grand Canyon took millions of years to carve, but the moon's grand canyons took about ten minutes. Nell Greenfieldboyce
These bonobos know what you don't know A new study shows that bonobos seem to know a little bit about what's going on in a human companion's mind, and will try to help. Nell Greenfieldboyce
Trump targets USAID as Marco Rubio becomes acting head of the embattled agency Secretary of State Marco Rubio says he is acting director the U.S. Agency for International Development, following days of upheaval at USAID as the Trump administration froze many of its programs. NPR Staff
