The Other Twitterverse: Squirrels Eavesdrop On Birds, Researchers Say
A squirrel wondering if it's safe enough to forage for food apparently listens for the reassuring chatter of nearby birds, a study finds.
Science
![Bags of heroin, some laced with fentanyl, picked up in a 2016 New York City drug bust. "Basically, [fentanyl] is so cheap to produce and it's so powerful, that drug dealers began realizing it was a way to increase their profits," Fentanyl, Inc. author Ben](http://wfdd-live.s3.amazonaws.com/images/story/Fentanyl-As-A-Dark-Web-Profit-Center-From-Chinese-Labs-To-US-Streets-757101225-1567623610.jpg)
Fentanyl As A Dark Web Profit Center, From Chinese Labs To U.S. Streets
Fentanyl, Inc. author Ben Westhoff says the opioid, while useful in hospitals, is killing more Americans as a street drug than any other in U.S. history. Here's how it moves from China to your corner.
WATCH: Walmart Is Discontinuing Some Ammo Sales. Here's Why It Matters
Not all bullets are created equal. This video compares the damage caused by different kinds of rounds.
How High Heat Can Impact Mental Health
A new NPR probe found low-income areas in dozens of major U.S. cities are more likely to be hotter than wealthier ones, and people with severe mental illness are impacted by that increase in heat.
As Rising Heat Bakes U.S. Cities, The Poor Often Feel It Most
Hotter neighborhoods tend to be poorer in dozens of major U.S. cities. That extra heat can have serious health effects for those living there.
Engineers Can Help Save The Earth
John Browne, Lord Browne of Madingley, used to be the CEO oil and gas giant BP. In 1997, he talked about the existence of climate change.
Global Carbon Emissions Continue To Rise Despite Efforts To Cut Them
NPR's Ailsa Chang talks with Steven Davis, earth system scientist with the University of California-Irvine about why global carbon emissions continue to rise, despite efforts and pledges to cut them.
Submarine Hobbyists Help Researchers On Montana's Flathead Lake
Submarine hobbyists are helping scientists in Montana do environmental research on the state's lakes. Researchers couldn't otherwise afford to rent subs, and it gives the hobbyists a sense of purpose.
Amateurs Identify U.S. Spy Satellite Behind President Trump's Tweet
The satellite is believed to be among America's most advanced. Some believe it's as large as the Hubble Space Telescope.
Hurricane Dorian's Sluggish Movement Makes Future Path Hard To Project
The storm has slowed as it passes over the Bahamas, battering the islands. It's expected to move west and north, grazing Florida, Georgia and the Carolinas, but the track is less solid than usual.