Real time video of engineered nano-structures undergoing tests for strength and resilience. The weight lowers at the rate that a fingernail grows, only visible in extreme close-up. The nano-structures are as intricate as the Eiffel Tower, and you could fit a city block of them on the head of a pin. This is some of the strongest, lightest material in the world. This episode was made in collaboration with Julia Greer and Lucas Meza at the California Institute of Technology.