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Maxwell's equations

PHYSICS IN THE RAW  Maxwell’s equations are just some of the equations that make an appearance in two new physics books.

atomic clock

GRID’S GOT RHYTHM  The world’s most precise timepiece consists of strontium atoms in a grid, ticking off oscillations of laser light trillions of times per second.


SHRIMPIER STILL  A new measurement supports the idea that the proton is even smaller than its already-teeny textbook value. To measure the proton’s radius, scientists used lasers (apparatus shown) to jolt hydrogen atoms into higher energy levels, the spacing of which depends on the proton’s size.

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