Perfect calculation

Things like this make my brain happy.

Feels good man

I could sit and watch "rube goldberg" videos for hours and hours

Pittagora Suichi! (Pythagoras Switch) We used to watch these videos in primary school Japanese class :D

I can't stop watching this

mathematically satisfying

i want to think it isn't possible but I also want to think it is true

How many times would they have tried before getting that right....