Wood/Glass/Metal I found an interesting video about Magnetic Balls -- Science is great

Science kid LEO
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Who can tell me how does it work ?
 
Science kid LEO said:
Who can tell me how does it work ?
Magnetism.
I have the cubicle versions.

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Much easier to doodle.
 
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Thread 'Heating pad element sizing'

Three rabbits will be wintering in a 2m x 2m x 2m wooden hut. Outside temperature does not go below -30c (-22f) Planning to put a 50cm by 50cm 1mm thick stainless steel sheet on the floor of the hut (inside off course) My plan is to heat the sheet with a 50w PTC heater element https://fi.rsdelivers.com/product/dbk-enclosures/fg135600/dbk-enclosures-heating-element-75mm-50-w-100-240-v/dc/2995922?backToResults=1 Is this heater (50W) enough to keep the pad warm enough to sustain liquid...
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