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Diagram showing human heart
What’s the Difference Between Veins and Arteries?
Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.
What Is Earth’s Velocity?
Solar system illustration. (planets; sun)
Why Are Planets Round?
Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles
Why Is Pluto No Longer a Planet?
Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.
Is Earth Going to Change the Direction in Which It Rotates?
Discover
Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that
America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)
Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.
What Is the Emoluments Clause?
Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society
12 Novels Considered the “Greatest Book Ever Written”
Bakers Dozen of Donuts, or Paczki's
Why Is a Baker’s Dozen 13?
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?
Bristlecone pine (Pinus Longaeva) on the slope of Mount Washington in Great Basin National Park in the Nevada desert.
How Can Some Trees Survive for Thousands of Years?

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