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.
Science
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.
Blind From A Bad Diet? Teen Who Ate Mostly Potato Chips And Fries Lost His Sight
A poor diet can lead to vision loss, experts say. For a teen, it's certainly rare, but a new case study documents blindness in a boy who ate lots of chips, white bread and bits of processed meat.
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.
Millennial And Gen-X Travelers: Need Another Measles Shot?
Americans born in the '70s and '80s may not be immune to measles, health officials say. If you're traveling to a country or region having an outbreak, consider a second dose of vaccine before you go.