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Aldersey-Williams, Hugh A molecule is a messy thing. It has a gangling skeleton whose bones are chemical bonds and whose joints are its component atoms.

Barrow, Gordon M. The chemist must learn to live in, and to feel at home in, the world of molecules. It is not enough that he knows the chemical constitution and chemical reactions of the materials around him. To be really effective and successful, he must also develop an intimacy with the molecular world. He must fit himself into the molecular scale of things. He must put that first drummed-in chemical fact that molecules are small in the very back of his mind and replace it by a consciousness that molecules are real, intricate, structural arrangements of atoms in space.