Which usually has a negative slope, except for the two most important substances on Earth, which are water and silicon. So for water and silicon, we have positive slope.

它的斜率一般负的，除了水和水和硅以外，对于水和硅，斜率是正的。

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This toxin is one of the most dangerous substances on earth.

这种毒素是地球上最危险的物质之一。

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The chemical structure of water also makes it different from almost all other substances on earth.

水的化学结构也使它与几乎所有地球上其它的物质不同。

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We learn why water, unlike most of the substances we run into on Earth, is denser in its liquid than in its solid form (H2O molecules are kinked rather than straight, so the space between them increases when water is quiescent).

FORBES: The Story Of Eau