Tick tock tariff: A wiggling "nano-clock" reveals the entropic cost of measuring time. (Courtesy: Natalia Ares) Imagine the sound of a ticking clock. How much time passes between each tick? For a good ...

As the old year ticks away, we'll enjoy some unusual musical ways of telling time this morning with Haydn's "Clock" Symphony, and "The Flower Clock," inspired by an 18th Century Garden.

Appraisal: Classical French Chariot Clock, ca. 1810, from Vintage Louisville. Check out Gordon S Converse's appraisal of a Classical French chariot clock, ca. 1810, in Vintage Louisville.

A photo of the atomic clock setup complete with the bisecting cavity. Credit: JILA/Ye Group Historically, JILA (a joint institute established by the National Institute of Standards and Technology ...