Hand inside vacuum chamber experiment.
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Previously:
https://www.homemadetools.net/forum/...015#post160566
https://www.homemadetools.net/forum/...478#post196936
https://www.homemadetools.net/forum/...070#post138031
https://www.homemadetools.net/forum/...745#post193978
https://www.homemadetools.net/forum/...748#post193998