Atoms consist of a positive nucleus and negative electrons flying around outside it. Electrons closest to the nucleus feel a strong negative-on-positive tug, and the bigger atoms get, the bigger the tug. In really big atoms, electrons whip around at speeds close to the speed of light.

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Atoms consist of a positive nucleus and negative electrons flying around outside it. Electrons closest to the nucleus feel a strong negative-on-positive tug, and the bigger atoms get, the bigger the tug. In really big atoms, electrons whip around at speeds close to the speed of light.

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In motivating people, you've got to engage their minds and their hearts. I motivate people, I hope, by example – and perhaps by excitement, by having productive ideas to make others feel involved.

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In motivating people, you’ve got to engage their minds and their hearts. I motivate people, I hope, by example – and perhaps by excitement, by having productive ideas to make others feel involved.

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It may be the optimist in me, but I think America has a uniquely powerful and capacious glue internally. The American identity has always been ethnically and religiously neutral, so within one generation you have Italian-Americans, Irish-Americans, Chinese-Americans, Jamaican-Americans – they feel American. It's a huge success story.

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It may be the optimist in me, but I think America has a uniquely powerful and capacious glue internally. The American identity has always been ethnically and religiously neutral, so within one generation you have Italian-Americans, Irish-Americans, Chinese-Americans, Jamaican-Americans – they feel American. It’s a huge success story.

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