Ground stop at 3 DC-area airports lifted after halting due to ‘strong chemical smell’

EPA moves to weaken pollution limits on chemical used to sterilize medical equipment

Raucous bird tornado touches down as snow geese make annual flight to Arctic

Southwest to end service at Dulles this summer

‘Initial aggression’ from baby elephant’s mom, aunties more welcoming, zookeepers say

Flu vaccines didn’t work that well in the US, officials find