These have a "second encore at a concert" vibe.
Every time I write about particle physics, I encounter a moment of uncertainty about a quantity that, at first glance, ought to be clear. How many kinds of elementary particles should I say there are?
Photos on social media are showing plumes of smoke rising from Edwards Air Force Base in California after a B-52 Stratofortress crashed earlier today. Officials at Edwards Air Force Base just ...
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