Learn more about Jane Street’s Hong Kong internship opportunities: The GelSight Microscope can map out the exact shape of tiny objects. It's used in metrology. This one can measure even smaller details than the last one. Original GelSight video: The video in which I drill the nail on my thumb: Atomic trampoline video: You can buy my books here: You can support me on Patreon and get access to the exclusive Discord: Twitter: Instagram: Facebook: TikTok: Buy nerdy maths things: