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"It's fundamentally altered my perception of what people are like. "

"We are human, not because of what makes human, we are human because we are. We recognize other humans."

Professor Sang-Hee Lee is an explorer, of sorts. She's a biological anthropologist at the University of California, where she specializes in advancing our knowledge of human evolution. She trained in Korea, the US, and Japan, and is a professor of anthropology at the University of California.

When an American died on a mysterious island, it threw a spotilght on an unknown group of people. Sentinel Island, about the size of Manhattan, lies in the Bay of Bengal. It's home to a pre-neolithic tribe who have occupied the area for more than 30,000 years - and they kill nearly everyone that approaches. In this episode, we talk to a reporter in India who tells us why they're so hostile to foreigners.

One organisation currently owns and controls all the emoji in the world. So who are they? And how do they decide what we type on the internet?

How did China end up with more bicycles than any other country in the world?

When Ashlee was growing up in Kentucky, her mother told her about the rules for shopping as a black women: Never put your hands in your pockets, don't touch anything, always be polite. This is a story about what happens when no one's watching you shop.