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Snow 雪 Snow comes from clouds, and it is made of snowflakes. 雪从云里来，它是由雪片形成的。 As snowflakes grow bigger and heavier in the cloud, they fall toward the ground. 当云中的雪片变得更大、更重时，它们就会落向
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Here's the key part. 接下来是关键的部分。 The solution nearest the wall spins faster than the solution closer to the middle. 离试管壁最近的溶液，要比中间的溶液旋转得更快。 That difference in velocity creates sheer str
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Of all the plastic produced since the 1950s, less than 10% has been recycled. 20世纪50年代以来，产生的所有塑料中，只有不到10%得到回收。 The vast majority ends up being dumped, most of it in landfill. 其中大部分都成了垃
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导语：上课时躲在书后面打盹儿，开会时用手挡着眼睛打盹儿，被逮着了就拿春困、秋乏、夏打盹儿，睡不醒的冬三月来做借口。大概每个人都经历过这样的情形吧，咱们今天就来说说这个打
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Let's begin by looking at what we currently understand about the neuroscience of Alzheimer's. 让我们先看看目前神经学上对老年痴呆的了解。 Here's a picture of two neurons connecting. 这是一张两个神经元连接的图。 The p
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