In a metal like copper, however, the outer electrons swim around freely and are shared by all the atoms. That’s why ...

The Northern Cass school district in North Dakota last spring graduated its first class of seniors who went through most of high school without receiving letter grades. Instead, their report cards ...

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I’ve been a Scientific American subscriber since I was 12 years old, and it helped shape the way I look at the world. SciAm always educates and delights me, and inspires a sense of awe for our vast, ...