And that's really neat to think about, because photons, of course, are massless particles, they have no mass, so it's neat to think about something that has no mass, but that actually does have a momentum.

而且那真的不容易想明白，因为光子，当然是无质量的粒子，它们没有质量，所以这个真的不容易想明白,一些物体没有质量，但是它们事实上确实有动量。

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that's still something really neat that I can do in my free time.

我在空闲的时间还可以做一些很有意义的事情。

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And it's neat to see the glowing jellyfish and think about the fluorescent protein that's in them.

你可以看到整齐的水母,而且考虑它里面的蛋白质。

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And that's not 'neat, ' and that's not 'cool.

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One reason people love Stephin Merritt is that he's neat.

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"Sure it's neat that I can buy a book online, " says Don St.

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