This is a summary of: Vilas, N. B. et al . An optical tweezer array of ultracold polyatomic molecules. Nature628 , 282–286 (2024) . The project . Cooling atoms to ultracold temperatures of less than one millikelvin and controlling their internal energy states has led to the development of numerous technologies, including optical atomic clocks1and neutral-atom quantum computers2. Unlike atoms, molecules can rotate and vibrate, making them more challenging to contro...