Twitter said it was working with law enforcement to investigate whether purported ISIS-related threats against co-founder Jack Dorsey were real.
There are fewer than 100 vaquitas left, and this rare species of porpoise may be extinct in three years. Learn more about this endangered creature.
Plans to generate electricity from the world's first series of tidal lagoons are unveiled in the UK, with sites proposed in Wales, Somerset and Cumbria.
(Reuters) - Manufacturers' tests of procedures to clean medical scopes linked with "superbug" outbreaks contained flaws that render their cleaning instructions unreliable, according to a senior official with the U.S. Food and Drug Administration.
By Irene Klotz CAPE CANAVERAL, Fla (Reuters) - Two U.S. astronauts whipped through a third spacewalk outside the International Space Station on Sunday to rig parking spots for new U.S. space taxis. Station commander Barry "Butch" Wilmore and flight engineer Terry Virts expected to spend about seven hours installing antennas, cables and navigation aides on the station's exterior truss. Instead, t