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40,619 published items in this category and its subcategories.

Origin of the name of America
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Origin of the name of America

Why do we call America America, not Vespucia? Scientists have asked this question for centuries and here is a most convincing explanation.

December 18, 2018
What happens when you drink mercury?
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What happens when you drink mercury?

Summer came, I kept checking the thermometer to see how hot it was. When the temperature reached 25 degrees Celsius, I would go to the beach to play, set up tents and pl…

December 18, 2018
The reason the sky at sunset is red
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The reason the sky at sunset is red

The phenomenon of light scattering in the atmosphere causes the sky to be blue during the day but turning red at sunset.

December 18, 2018