Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
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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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Hockey player Jarome Iginla donates $2,000 to the children’s charity Kidsport for every goal he scores. Since 2000 it has added up to more than $700,000.
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There's a regenerative candle that creates a new candle as it melts.
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