Daily Camera Archives

Luca Lorini, left, and Pat Hastings work on a second version of the mercury optical atomic clock, seen complete in the background, at the National Institute for Standards and Technology on Monday. The new clock, using a single atom, is five times more precise than the current standard, the "fountain" of cesium atoms. (cq all)(Photo by Marty Caivano/Digital First Media/Boulder Daily Camera via Getty Images)