The editors of Smithsonian magazine have announced the winners of their 12th annual photo contest, selected from more than 26,500 entries.
Chile's Calbuco volcano erupted on Wednesday, spewing a giant funnel of ash high into the sky over a sparsely populated, mountainous area, triggering a red alert. Authorities ordered an evacuation for a 10-kilometer (six-mile) radius around the volcano.
First organized in 1970, Earth Day is a day set aside to remember and appreciate the Earth's environment, and our responsibilities and roles within it. Today, April 22, we observe the 45th annual Earth Day, and though many things have changed for the better, environmental challenges remain.
The continued massive growth of connected mobile devices is shaping not only how we communicate with each other, but how we look, behave, and experience the world around us.