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Bone density, inflammation and bionic eyes

Bone density, inflammation and bionic eyes

Thursday 12th September 2019 1:00 pm

Why do we have toe nails? Can we dry our clothes by freezing them? Why are sunrises and sunsets different colours?

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@beakerstreetsci
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Water will change its density a little bit with temperature, but ethanol does it 3.7 times better – and the modern liquids in a Galileo Thermometer are better again. This liquid is inside a sealed container – to avoid the effects of the changing air pressure.
Inside the container are a bunch of hollow, weighted glass balls – each carefully calibrated to have a different density, and each with a brass tag indicating the temperature. The single ball that is floating freely indicates the temperature of the liquid.
So what is your favourite super-geek item/collection, and why? And is it useful or beautiful, or both, like the Galileo Thermometer?