Something unexpected happened when scientists at the University of California, Riverside, started stringing together nanoparticles of gold.
The gold wasn't golden anymore. It changed colors.
"When we see these gold particles aggregate, we find out they have very, very beautiful blue colors," chemist Yadong Yin told me. That bright blue would dissipate like a sunset—morphing into purple, then red—when scientists warped the strings, breaking apart the nanoparticles