If you chew gum when you study a subject and then chew the same flavor when you take the test, it will help you remember!
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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 love mattress that is specifically designed for couples who sleep on each other's arms.
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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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In the case of an emergency, a Crayola crayon can be used as a candle and will burn for about 15 minutes.
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