Balsa wood is classified as a hard wood!
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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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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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Sound travels fifteen times faster through steel than through air.
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The only letter not appearing on the Periodic Table is the letter "J".
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For a high school science fair project, 17-year-old Michio Kaku built a particle accelerator in his parent's garage that was able to generate a magnetic field 20,000 times greater than the Earth's and produce collisions powerful enough to create antimatter.
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A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
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