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Many people who tried to access content on the platform were met with error messages. Twitter CEO Elon Musk said "extreme levels of data scraping" were affecting user experience on the site.

The CITES convention agrees in principle to limit the trade in five types of shark and two types of manta ray in a crackdown on the trade in shark meat and fins.

A 12,400-mile journey by a great white shark puts a snag in the theory that the animals stick close to established feeding grounds. The trip is bolstering claims that the sharks need worldwide protection.

New evidence adds to hopes that the ivory-billed woodpecker, feared extinct, is alive in eastern Arkansas. Researchers have captured bird calls and rapping that reinforces video evidence of a bird in flight.

Voters of color should not be treated as "get-out-the-vote targets," says the head of one of the groups that issued the report. Instead, outreach needs to start one to two years before an election.

David Greene talks to Douglas MacMillan of The Wall Street Journal about how Google may have exposed private data of hundreds of thousands of Google+ users and then opted not to disclose the issue.

President Trump boarded Air Force One last month as usual. But the Washington Post reports he was smuggled off the plane in a catering truck and flew on an entirely different aircraft due to a threat.

The Trump administration is considering limiting Chinese surveillance company Hikvision's ability to buy American technology, according to reporting from The New York Times.

A new report says ISIS is manufacturing large quantities of sophisticated weapons. NPR's Ailsa Chang talks to James Bevan of the research group Conflict Armament Research, which issued the report.

The last known Tasmanian tiger died more than eight decades ago. It has become the stuff of textbook sketches and yellowing photographs. But now, researchers are launching a new search.