I measure the force produced by shining a laser on a mirror. First video: https://www.youtube.com/watch?v=AKluWwojOls How to build the balance: http://sci-toys.com/scitoys/scitoys/mathematics/microgram_balance/balance.html Music: https://www.youtube.com/watch?v=q64r8CasKO0 Help me make videos and see them early by donating here: https://www.patreon.com/CodysLab