Special operations forces are perceived as the solution to any problem in the new U.S. defense strategy, experts say.
Both sides dug in over threat Crimea will revert to Russia.
Researchers have discovered a simpler way of diagnosing Alzheimer's disease before it strikes.
It could take investigators months, if not years, to determine what happened to the Boeing 777.
Tradition has taught Americans to tip for just about everything. Here, a guide to tipping internationally.