Wild horses in the west: A look at America's mustang problem Scientists say there are more horses than the land can support. But some believe the horses should be left to run free. Play AudioListen 6 mins
A study finds that dogs can smell your stress — and make decisions accordingly Researchers made volunteers do public speaking and math on the spot, then showed them a calming video. Then, using sweat samples, glass jars and food bowls, they examined the emotional impact on dogs. Rachel Treisman
Peekaboo! A baby tree kangaroo debuts at the Bronx Zoo The second baby of a tree-dwelling kangaroo made its public debut this week in New York, poking its pink head head out of its mom's furry white pouch. The Associated Press
The fate of the most powerful X-ray telescope is in doubt NASA's budget proposal would basically axe the most powerful X-ray telescope in the world, and astronomers are scrambling to save it. Nell Greenfieldboyce Play AudioListen 4 mins
Dark energy — which causes the expansion of the universe — may be changing One of the big mysteries of the universe is how it's expanding. The phenomenon causing that expansion is known as dark energy — and recently, scientists have started to wonder if its changing. Regina Barber Play AudioListen 4 mins
It’s not a B movie: scientists say sharks are ingesting cocaine in drug-tainted water Illegal narcotics may be damaging marine wildlife. Sharks are swimming in drug tainted waters, ingesting cocaine according to scientists in Brazil. John Otis Play AudioListen 3 mins
Scientists may have discovered 'dark oxygen' being created without photosynthesis It has long been understood that photosynthesis creates oxygen, but researchers believe they've found oxygen being created in parts of the ocean with no light. Regina G. Barber Joe Hernandez
A hydrothermal explosion sends Yellowstone visitors running A video posted on Facebook showed park visitors running from a massive black cloud as it rose. Hydrothermal explosions happen when water suddenly turns into steam underground. James Doubek
Watch a livestream of Colorado’s ‘mega den’ of pregnant rattlesnakes On a rocky hillside in Colorado is a “mega den” of hundreds of rattlesnakes — along with cameras livestreaming the whole thing. Linnea Anderson Play AudioListen 4 mins
Here's how $4 billion in government money is being spent to reduce climate pollution Most states submitted plans to reduce planet-warming pollution to unlock federal grant money, and they proposed projects to get started. This week, the Biden administration announced the winners. Ellis Juhlin Halle Parker, WWNO Jessica Meszaros
