The best showcase of nanotechnology so far may be this race of tiny cars

Just as robot car competitions led us to the cusp of self-driving cars for the masses, so to perhaps this nanocar race could lead to efficient nanoscale transportation:

https://qz.com/964349/the-nanocar-race-will-feature-the-worlds-smallest-cars-compete-on-a-gold-track-at-absolute-zero/