WHILE EINSTEIN AND Hubble were productively unraveling the large-scale structure ofthe os, others were struggling to uand 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 reducestific history to one important statement it would be “All things are made of atoms.” Theyare everywhere and they stitute every thing. Look around you. It is all atoms. Not just thesolid things like walls and tables and sofas, but the air iween. And they are there inhat you really ot ceive.
The basic w arra of atoms is the molecule (from the Latin for “little mass”).
A molecule is simply two or more atoms w together in a more or less stablearra: add two atoms of hydrogen to one of oxygen and you have a molecule of water.
Chemists tend to think in terms of molecules rather thas in much the way thatwriters tend to think in terms of words and not letters, so it ……（内容加载失败！）
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