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The social media giant says it will not allow tweets containing "unsubstantiated rumors, disputed claims" or promotion of "out of context information" about the vaccine.

The Food and Drug Administration says is advising health workers to use "every full dose obtainable" to help speed up the nationwide immunization campaign.

Science writer Robin Marantz Henig has written about dangerous emerging pathogens for 30 years. But none of what she learned could shed light on her own confusing encounter with this virus.

As part of President Trump's promised crackdown on illegal immigration, he wants to bolster a program former Arizona Sheriff Joe Arpaio aggressively practiced.

Responding to reports of Huntsman's selection, the Kremlin says it would welcome any U.S. ambassador who wants to create a dialogue with Russia.

A second suicide bombing occurred at a restaurant in the city's Rabweh district. The attacks, on the sixth anniversary of the Syrian uprising, are the latest to target the country's capital.

Phil Elverum's heartbreaking tribute to his wife — Geneviève Castrée, who died last year from pancreatic cancer — was recorded using her instruments.

Making contraceptives available over the counter is safe, a review of research finds, and could lead to fewer unplanned pregnancies in both teens and adult women.

The South American polka dot tree frog initially appears unremarkable. But when researchers in Argentina shone an ultraviolet light on the frog, it glowed.

The Secret Service took a driver into custody late Saturday. Earlier that day a man jumped over a bike rack trying to get past a White House fence. And on March 10 an intruder breached the perimeter.