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Only a Black Hole Could Make a Black Hole That Massive!

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Black holes may merge to produce second-generation black holes. Learn more about black holes at HowStuffWorks.

Orion Nebula Is Scene of Epic Star Battle

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In this stellar nursery, firstborn stars are ruthless.

Otis Carr

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Otis Carr was a businessman and hoaxster who founded OTC Enterprises to build and sell a free-energy spaceship, the OTC-X1. Read more about Otis Carr.

Otzi the Iceman Ate a High-fat Last Meal

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Researchers say that Otzi, the ancient man found in the Alps in 1991, lived on a diet loaded with fat to maintain warmth and energy in his cold, high-altitude environment.

Our Amazing Solar System

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Our solar system has a variety of small objects such as asteroids, comets, stars, meteors, and moons. Find out how they affect life on Earth.

Overtone

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Overtone is a sound accompanying the main tone produced by a vibrating body. The number and loudness of overtones determine the timbre, or tone color, of a musical sound.

PEMDAS: Remembering Math's Order of Operations

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A simple math problem may seem to some of us like an inscrutable pile of numbers and symbols, just waiting to trip us up. PEMDAS to the rescue!

Pantheon vs. Parthenon: What's the Difference?

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It's easy to confuse the Parthenon and the Pantheon. The names are so similar, and they're both ancient ruins. But despite those similarities, the two structures are very different.

Panzerkampfwagen VI Tiger I

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The Panzerkampfwagen VI Tiger I was a formidable battle tank in World War II. Learn about the design and history of the Panzerkampfwagen VI Tiger I.

Pareidolia: Why We See Faces in Almost Everything

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We see faces in clouds, on buildings - heck, in grilled cheese sandwiches. But why is that? And how is this a help to our survival?