Microscopic Machines Controlled by Design Changes

We can now control the speed of microscopic machines just by swapping out one tiny part.

Scientists built these incredible molecular machines where a tiny ring slides along a dumbbell-shaped

axle between two "parking spots." Using an electrical jolt, they kick the ring

from its favorite spot, forcing it into a high-energy state. Because of a cleverly

designed barrier, this high-energy machine is so stable it can be isolated as a solid.

Here's the wild part: they made two versions, only changing the second parking spot.

Swapping one type for another made the ring move 3.5 times faster