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A U.S. effort to discourage immigrants' repeated attempts to enter the country illegally by dropping them back in Mexico hundreds of miles away from where they were caught has been sharply scaled back after producing relatively modest gains.
Northeast at Risk for Severe Storms, Flash Flooding Next Week
Return of Polar Vortex to Trigger Midwest Storms, Chill
Manhattanhenge: Clear View Anticipated After Clouds Obscured May Skies
As light rain falls on Elephant Nature Park in Chiang Mai, Thailand, on July 8, 2014, herds of rescued elephants are in pure bliss - dancing and splashing together around the park.
Vortices of air constantly surround us, invisible to the naked eye until something physical gives them shape. Take a look at some of nature's most awe-inspiring vortices.