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Harold McGee talks about how our sense of smell affects taste, why things smell the way they do and the ways different chemicals combine to create surprising (and sometimes distasteful) odors.

Two U.S. intelligence agencies reportedly support the lab leak theory — with low-to-moderate confidence. No evidence has been shared. Scientists have strong evidence of animal spillover at a market.

As searchers continue to look for victims in the deadly flash flooding in Texas, officials are answering questions about the weather forecasts ahead of and during the storm.

There is still no indication the trapped miners are alive after being cut off by a mountain of rock some 1,500 feet underground. Early Friday, crews drilling holes in a Utah mountain lowered a microphone to the spot where the collapse occurred, but heard no sounds. The mine's owner remains hopeful.

Hours after launching a Kickstarter campaign to revive a TV show that made horrible movies enjoyable, Mystery Science Theater 3000 creator Joel Hodgson raised a quarter of his $2 million goal.

While the glaciers hold enough water to raise sea level feet by 20 feet, a new study says the runaway meltdown of Greenland's ice isn't happening as some had feared. This means a "worst-case scenario" of 6 feet of sea level rise by the end of this century is unlikely, a polar researcher says.

The U.S. and international monitors are expressing concern over delays in the the handover of Syria's chemical weapons arsenal. Many experts now suspect that Syrian President Bashar al-Assad's regime may be dragging its feet.

Surgeon General Vivek Murthy wants tobacco-style warning labels for social media. NPR's Leila Fadel talks to clinical psychologist Michaeline Jensen, who has studied social media's effect on kids.

Solar geoengineering — increasing the sunlight reflected back into space to cool the planet — is gaining the attention of people looking for climate solutions. But critics say it comes with risks.

The comments came shortly before talks kicked off in Dubai. In reality, scientists warn that further fossil fuel development is driving global warming.