What do dolphins, humans and volcanoes have in common? They can all produce toroidal vortices of course! Surprised? Grab some food colour and a glass of water to find out how. 1. Fill a tall glass to ...
Challenge a friend to lift a marble or round lolly (or any spherical object) off a table touching it only with a glass. They'll never succeed of course. You however, are an intergalactic master of the ...
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