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Scientists are always looking for a more accurate answer to the question, "What time is it?" Now they've built the most precise atomic clock yet — but it's not just telling time. It has the potential to investigate the accuracy of the General Theory of Relativity.

Physicians in Berlin say that anti-Kremlin activist Pyotr Verzilov's illness does not appear to be caused by infection or disease. But they could not confirm what he was poisoned with, or by whom.

For years, three physicists worked to prove Albert Einstein's idea that gravitational waves are rippling through space-time. In 2015, they made history as part of the LIGO Collaboration.

Also: Rock musician Tom Petty has died; the Supreme Court takes up a gerrymandering case; and baseball's Hall of Fame is getting a bobblehead museum collection.

After years playing a version of himself on the HBO series Curb Your Enthusiasm, David has a distinct comic sensibility and a very recognizable voice and persona. Originally broadcast March 5, 2015.

The scientists honored with a Nobel Prize in medicine helped discover that every cell in the body has its own clock. When we ignore those clocks, we increase the risk of weight gain and diabetes.

Three scientists won this year's Nobel Prize in Physics for their discovery of gravitational waves. These ripples in space and time are generated when really big things, like black holes, collide.

The Land of Lincoln is the country's largest de facto nuclear waste dump.

The parents of a terminally ill British child have until Thursday to make their own arrangements for his care, otherwise he will be taken to a hospice and allowed to die peacefully.

Taiwanese electronics giant Foxconn says it will build its first major U.S. manufacturing plant in Wisconsin. Wisconsin offered Foxconn up to $3 billion to locate there.