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

7 wars cost the most money in history
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7 wars cost the most money in history

Those were the most expensive wars in history, and also the bloody war that killed millions of people, lost their homes and relatives ...

December 18, 2018
Why is vein green?
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Why is vein green?

The blue of veins is visible due to the interaction of light with the skin, the amount of oxygen in the blood and other factors.

December 18, 2018
How does volcano change the Earth?
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How does volcano change the Earth?

Volcanic eruptions have changed lives as well as human history for over 2,500 years, and are the cause of the coldest summers from 500 BC (BC) to 1000 AD. (AD).

December 18, 2018
8 most exciting chutes in the world
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8 most exciting chutes in the world

Slide at speeds of over 100 km / h, slide through dolphins, rising sharks swim or through spiral lines to give visitors a feeling of extreme excitement.

December 18, 2018