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Rajiv Shah joins the show.

Io’s intense volcanic activity defies all expectations.

Kenneth Stern, an expert on hate, shares his concerns with suppressing speech on and off campuses.

The state of Iran’s nuclear program after U.S. airstrikes

The FBI confirmed that a nationwide search remains in effect for Christopher John Worrell, a Naples man and a member of the 'Proud Boys' extremist group, who disappeared in August, days before his sentencing in the U.S. Capitol riot case, where prosecutors are seeking more than a decade in prison. The main legal representative for Worrell, Attorney William Lee Shipley, Jr.of Kailua, Hawaii, appeared on a cable network news show Monday night and said he has not heard from his client since before he vanished.

Bird brains may be tiny, but they pack in as many—or more—neurons as much larger animals.

Editor of The New Yorker David Remnick reflects on the magazine's 100th birthday.

Chris Jennings discusses his new book "End of Days."

See the great citizen science work going on at the New York Botanical Garden.

The legal definition of hemp is a cannabis plant that has no more than 0.3% of THC.