Museum Conservation Institute scientists used a nondestructive technique called X-ray fluorescence spectrometry to analyze ratios of elements in the obsidians. The process works by “exciting” atoms in ...

Perhaps the best thing that could be said about President Donald Trump's military/birthday/“Look at me I’m president” parade was that it was kinda ... cute.  Surreal, sure. Problematic, ...

During Jim Crow segregation, political leaders used domestic military power to preserve the interests of racial ...