PICATINNY ARSENAL, N.J. -- During a firefight, the last thing a machine gunner wants to do is stop fighting to change barrels, but that's how it has always been done with standard, single steel-barrel ...
Galaxies are pretty well understood on the whole. We know they’re made mostly of dark matter, we know how they move and rotate, and have grouped them into several classes. We even know a bit about the ...
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