A mysterious blue object spotted between President Donald Trump’s teeth at the U.S. Open set off a social media firestorm and fueled speculation and plenty of mockery about the president’s health.

A small international team of life scientists has discovered why biting flies are attracted to things that are blue. In their study, reported in Proceedings of the Royal Society B, the group used an ...

Add Yahoo as a preferred source to see more of our stories on Google. Some blue material at the bottom of the Lincoln Memorial Reflecting Pool is peeling off, days after it was painted blue and ...