A new atomic clock is one of the world’s best timekeepers, researchers say — and after years of development, the “fountain”-style clock is now in use helping keep official U.S. time.

President Donald Trump stocked his first term with characters out of Republican central casting. There was Vice President Mike Pence, the evangelical; Chief of Staff John Kelly, a Marine general; and ...

At the heart of this change is a new kind of atomic clock that uses light instead of microwaves. This shift means timekeeping could become 1,000 times more accurate than today's standards.

Peering into wastewater for public health has a history dating back at least to the late 19 th century, when a biologist in Boston cultured sewage in beef jelly, bouillon, boiled potatoes, and milk to ...