Orcas are social learners and occasionally get caught up in fads — a temporary behavior started by one or two individuals, adopted by others and then swiftly abandoned. For example, a population in ...

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Ozone is a molecule made of three oxygen atoms. It's relatively highly concentrated in a particular layer of the stratosphere about 12 miles to 19 miles (20 to 30 kilometers) above Earth's surface.

In 1915, Einstein published his theory of general relativity, which states that light will bend around massive objects because space itself becomes curved around such objects. A chance to test the ...

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