A police officer was killed during a protest in Kiev on Monday. It was the first such fatality since Ukraine's "Revolution of Dignity" last year. Radical nationalists, some with weapons, gathered to protest a constitutional amendment proposed by President Petro Poroshenko that would make…

Taking a midday nap might be beneficial for your heart, new research suggests. The investigators looked at how an hour-long siesta at noon affected blood…

Tourists throughout the centuries have visited the famous Acropolis, the ancient hilltop religious citadel in Athens. Thousands of sightseers from all over the world have picked up marble chunks as souvenirs. Why hasn't the supply of pieces been exhausted long ago? The answer is very simple. Every…