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NPR's Scott Simon speaks with Amanda Fennell, a cybersecurity expert, about CAPTCHA tests that verify if a website visitor is human or bot. They are getting harder.

It's all in the timing. Biologists haven't been able to breed embryos of the rare, pillar coral in the lab because it's been tough to catch the creatures in the act.

A group of scientists is embarking on a bold plan to better understand an extremely understudied part of the rapidly warming Arctic — the central Arctic Ocean.

NPR's Ailsa Chang talks with Dr. Barbara Ziv, the forensic psychiatrist who testified at the retrial of Bill Cosby, about the focus that the prosecution put on educating the jury about common misconceptions around rape.

Over 800 years before tea was known in the West, a Chinese master penned the The Classic of Tea. In it, he blends the practical with the spiritual and emphasizes rituals from cultivation to drinking.

In his six-decade career, Levine found grace and beauty in the lives of working people, especially the people and places of his youth. He was a United States poet laureate and a Pulitzer Prize winner.

Blair Kamin, the Chicago Tribune's Pulitzer Prize-winning architecture critic, gives host Jeremy Hobson a tour of downtown Chicago's architecture.

Professor Jonathan Mayer of Princeton University built a system like Apple's to flag for child sex abuse. He talks to NPR about why he's warned against using the system and believes it is dangerous.

David Greene talks to former national security official Richard Clarke about the fight between Apple and the FBI. The FBI wants an iPhone that was used by one of the San Bernardino shooters unlocked.

J. Ivy says his father grew up in pain and passed that pain on to the next generation. In his new book, he says that forgiveness is an ongoing act — and you must constantly remember to forgive again.