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A volunteer petting a dog at an animal shelter.
Volunteering is one way you can help pets in animal shelters without having to adopt.
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White mushroom cloud of the first hydrogen bomb test over the Marshall Islands.
The first hydrogen bomb test, as part of Operation Ivy, detonated over the Marshall Islands in 1952.
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Fukushima
A Tokyo Electric Power Co. employee wearing a protective suit and mask near storage water tanks.
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Earth from space.
We're moving so much water from under the continents to the oceans that it's affecting our axial tilt, a new study found.
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Avi Loeb Stephen Hawking 2016.JPG
Physicist Avi Loeb, right, on stage with physicist Stephen Hawking and others in New York in 2016.
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Illustration of a face mite.
Scientists still aren't sure why humans play host to these tiny creatures.