Pinyin: lì English Definition: grain; granule; classifier for small round things (peas, bullets, peanuts, pills, grains etc) Chinese Definition: ①成颗的东西，细小的固体：米粒。盐粒。颗粒。粒子(ａ．成果的、细小的东西，“子”读轻声；b．指“基本粒子”，物理学上指构成物体的最简单的物质)。 ②量词，多指颗粒状的东西：一粒米。一粒珍珠。[合]粒食(以米谷为食)；粒米束薪(极言粮草之少)；粒米狼戾(谷粒撒得满地都是。形容粮食充盈。)
If you want to train a laboratory rat to pull a crank to get a food pellet, the reflex will be scratched in deeper if the creature is rewarded with some regularity but not all the time.
A current can 'tunnel' across these gaps — another special property of the quantum world, where waves and particles can cross barriers without breaching them.
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