I've been to many science museums around the world, and this is one of the top ones in the world, and honestly the best one in the world in amount of cool big scale experiments they had in a single building. When we found that out, we spent 1.5 days going through all the presentations they had during the Xmas holidays, and we saw most but not all of the static exhibits:
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it is located at the back of the grand palais, an iconic building in Paris
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exhibits on magnetism, showing magnets lose their properties when they are too warm
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more interesting: stream of liquid gas is susceptible to magnetism
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supraconductive material, when cooled sufficiently will stay in a magnetic equilibrium
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induced electric currents from magnetism allow for levitation, and it's hot
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it's all about density, yes this is real water and a real bowling ball
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it gets to open a jar with a crab inside
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and then came the time for the full scale maglev demo
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a bit of time to cool down the supraconductive magnets
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oxygen in the air liquefies first, and causes flammable liquid
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safety goggles are for other people :)
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they had bucket fulls of liquid gas to play with