Some molecules respond to light in a matter of seconds. In the case of this dithienylethene compound, ultraviolet light triggers a ring-forming reaction, turning the colorless solution deep red.

These photographs of the stunning and at times almost unbelievable color gradients in food, rocks, ornaments, leaves, and more are simply amazing! My favorites are these citrus slices, radishes, ...

Acetaldehyde is a vital chemical used in making everything from perfumes to plastics. Today, its production largely relies on ...