I remove as much friction as I can so we can see if its light pressure or thermal recoil making the radiometer spin. Sprengel pump: https://www.youtube.com/watch?v=viJ3T-1KZqY The thing at the end: https://www.youtube.com/watch?v=AzNnQ4O8BTY Help me make videos by donating here: https://www.patreon.com/CodysLab