Astronomers have discovered a massive galaxy made almost entirely of dark matter. Called Dragonfly 44, the galaxy is basically 99.99 percent dark matter.

Astronomers have discovered a massive galaxy made almost entirely of dark matter. Called Dragonfly 44, the galaxy is basically 99.99 percent dark matter.

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DIY - Build a Hydraulic Ram Pump. Pump water without electricity!

DIY - Build a Hydraulic Ram Pump. Pump water without electricity!

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Space Junk Explained: How Orbital Debris Threatens Future of Spaceflight #Infographic

Space Junk Explained: How Orbital Debris Threatens Future of Spaceflight #Infographic

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Nitty Gritty Science: "Earth Science Interactive Notebooks Finally Here!!"

Nitty Gritty Science: "Earth Science Interactive Notebooks Finally Here!!"

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#Infographic About Addictive Personality Behaviors & Disorders – Overcoming Them & Avoiding Addiction

#Infographic About Addictive Personality Behaviors & Disorders – Overcoming Them & Avoiding Addiction

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Periodic graphics: chocolate chemistry | March 14, 2016 Issue - Vol. 94 Issue 11 | Chemical & Engineering News

Periodic graphics: chocolate chemistry | March 14, 2016 Issue - Vol. 94 Issue 11 | Chemical & Engineering News

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Teaching Resource: A set of two posters with information and diagrams about Solar and Lunar Eclipses. (subscription required)

Teaching Resource: A set of two posters with information and diagrams about Solar and Lunar Eclipses. (subscription required)

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What makes fireworks colorful? It's all thanks to the luminescence of metals. Find out more with this great graphic from NPR.

What makes fireworks colorful? It's all thanks to the luminescence of metals. Find out more with this great graphic from NPR.

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The National Institute of Mental Health estimates that more than 45 million Americans have a mental illness in any given year. Learn more about 5 types.

The National Institute of Mental Health estimates that more than 45 million Americans have a mental illness in any given year. Learn more about 5 types.

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Parts of the brain- really like this mapping!!

Parts of the brain- really like this mapping!!

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