Modern science is big: the gravitational wave detector (Ligo) cost more than a billion dollars, and the large hadron collider (LHC) in Geneva took decades to build and cost almost five billion euros.

Dear Helaine and Joe: I have finally summoned the courage to write and ask about this whirligig discovered in the barn of the old house my husband and I bought. I have no idea how old it is, or ...

A molecular machine that winds itself into a tight twist when exposed to light has a newly discovered ability: when the light goes out, the energy stored in the wound-up molecule makes it untwist and ...