There's a regenerative candle that creates a new candle as it melts.
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An Australian study found that homework is of little to no academic value to students in elementary and junior high schools.
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In 2011, a couple bought a box of textbooks for $10. Inside, they found a 25-cent bill signed by the president of the Republic of Texas, Sam Houston, and subsequently sold it for $63,250.
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All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
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Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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There's a café in France which charges €7 for a coffee to rude customers and €1.40 to people who talk politely to staff.
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