The Prince Charle Cinema in London has volunteer "ninjas" that hush obnoxious moviegoers.
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Students at MIT developed a wristband that can regulate your “thermal comfort”, which could possibly eliminate the need for central heating and cooling.
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
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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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