What to make of a Las Vegas building full of unidentified alloys? The New York Times published a stunning story last week revealing that the U.S. Department of Defense (DOD) had, between 2007 and 2012, funded a $22 million program for investigating UFOs (Editor's note: the link may be paywalled; alternative source). The story included three revelations that were tailored to blow readers' minds: 1. Many high-ranking people in the federal government believe aliens have visited planet Earth. 2. Military pilots have recorded videos of UFOs with capabilities that seem to outstrip all known human aircraft, changing direction and accelerating in ways no fighter jet or helicopter could ever accomplish. 3. In a group of buildings in Las Vegas, the government stockpiles alloys and other materials believed to be associated with UFOs. From a Scientific American report: Points one and two are weird, but not all that compelling on their own: The world already knew that plenty of smart folks believe in alien visitors, and that pilots sometimes encounter strange phenomena in the upper atmosphere. Point No. 3, though -- those buildings full of alloys and other materials -- that's a little harder to hand wave away. Is there really a DOD cache full of materials from out of this world? Here's the thing, though: The chemists and metallurgists Live Science spoke to -- experts in identifying unusual alloys -- don't buy it. "I don't think it's plausible that there's any alloys that we can't identify," Richard Sachleben, a retired chemist and member of the American Chemical Society's panel of experts, told Live Science. "My opinion? That's quite impossible." Alloys are mixtures of different kinds of elemental metals. They're very common -- in fact, Sachleben said, they're more common on Earth than pure elemental metals are -- and very well understood.