Colorado and Washington were the first states to legalize recreational marijuana in 2012. Here's which states have followed ...

California, as the most populous state, had the highest number of adults estimated to be on the autism spectrum, with 701,669 ...

Manila uses "West Philippine Sea" for waters in its maritime zone, where China's expanding presence challenges the U.S. ally.

Scientists discover massive deposits of this valuable resource sitting beneath the feet of millions of Americans.