WHILE EINSTEIN AND Hubble were productively unraveling the large-scale structure ofthe cosmos, others were struggling to understand something closer to hand but in its way justas remote: the tiny and ever- mysterious atom.

The great Caltech physicist Richard Feynman once observed that if you had to reducescientific history to one important statement it would be “All things are made of atoms.” Theyare everywhere and they constitute every thing. Look around you. It is all atoms. Not just thesolid things like walls and tables and sofas, but the air in between. And they are there innumbers that you really cannot conceive.

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