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The days of made-to-order ice cream are far from over in San Francisco. A small shop that operates out of an old shipping container uses liquid nitrogen to freeze ingredients together in about a minute for an ultra-fresh, ultra-smooth treat.

A scientist who studies tornadoes says there's still much to be learned about how they form and how to better forecast them. Still, the storm chasing and research communities will be reevaluating their procedures in the wake of three colleagues' deaths.

"The world is grateful for the heroes of Robben Island, who remind us that no shackles or cells can match the strength of the human spirit," the president wrote Sunday. He also unveiled a $7 billion "Power Africa" initiative, to bring electricity to the continent.

The death of an elderly man in Las Vegas is being blamed on temperatures that have soared past 110 degrees in many places. The National Weather Service warns that it's going to stay brutally hot in the Southwest for at least a few more days.

Robert Siegel interviews orthopedist Michael S. George, co-author of a study about the ethics in sports medicine and also a former team doctor.

Growing up, Ivor David Balding said that he would one day own an elephant. A lifetime later, the longtime circus showman leaves behind his best, and biggest, friend: an African elephant named Flora.

Environmentalists say we should eat up animals that are an ecological nuisance. Problem is, they don't usually look very tasty. A photo project tries to alter our perception of these critters.

To fit in their shipping container, two Mars rovers had to be folded up into a tiny package and then unfolded — a prime example of what NPR science correspondent Joe Palca calls "unfolding science."

If mom can't nudge kids to eat veggies, Maybe Disney teen stars will be more effective. Increasingly, companies are marketing healthy food to kids. Turns out, it's good for their bottom line, too.

Audie Cornish explores how marketing has been overlooked in technology. She speaks with Nancy Koehn, a professor of business administration at Harvard Business School, and Alex Kantrowitz of Ad Age.