4.5 pounds of sunlight strike the Earth each day.
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Balsa wood is classified as a hard wood!
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
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The hair of an adult man or woman can stretch 25 percent of its length without breaking.
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If the chemical sodium is dropped into water it will immediately and violently explode.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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