There are plenty of human-made monuments that boggle the minds of even the most acclaimed scientists and archaeologists. Here are 11 such monuments that remain a mystery.
All recorded (and unrecorded) history has taken place on Earth's surface, and our very bodies are molded to its particular blend of atmospheric gases, its constant gravitational pull, and its temperature-perfect distance from the sun. Here are 15 facts about the planet we call home.
Which natural phenomenon produced the loudest known sound? What widely misunderstood sea giant generates an ear-shattering kind of Morse code? Just how loud is an asteroid impact? These six giant sounds will put that garage band next door in some serious context.
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