Hook

Their other posts in the index, biggest breakout first.
This is one of the most incredible facts that exists. Imagine two 1 kg blocks on a perfectly smooth surface. One slides and collides with the second near a wall. The collisions are perfectly elastic, no energy is lost. In that case, exactly three collisions happen, but it gets more interesting if you increase the mass of the first block. If it weighs 100 kg, it keeps much more inertia and the small block starts bouncing many times between it and the wall. You get 31 collisions. If the first block weighs 10,000 kg, the exact calculation gives 314 collisions. And the most amazing part, if you keep increasing the big block's mass by powers of 100, the number of collisions will always match the digits of pi. If you vibe code, comment VIBE and I'll send you the link.