The common refrigerator's system of cooling was invented in Australia, in the 1850's, by James Harrison. By 1857 his machine was making up to 3 tonnes of ice a day!
There is a lake in the country of Palau where jellyfish evolved without stingers after the lake’s connection to the sea closed, leaving them isolated from their natural predators. These ‘Golden’ jellyfish are totally harmless to humans and you can swim with them.
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