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Khan Academy Partners with PhET to Bring Free Science Simulations to Your Classroom

来源: Khan Academy Blog ·

What happens to a population when its environment changes? How do cells control which proteins they make? Why ... Read more The post Khan Academy Partners with PhET to Bring Free Science Simulations to Your Classroom appeared first on Khan Academy Blog .

什么是 Khan Academy Partners with PhET to Bring Free Science Simulations to Your Classroom?

Khan Academy Partners with PhET to Bring Free Science Simulations to Your Classroom is a 网站 discovery curated from Khan Academy Blog. What happens to a population when its environment changes? How do cells control which proteins they make? Why ... Read more The post Khan Academy Partners with PhET to Bring Free…

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Unawares

From Samuel Butler’s notebooks, 1912: Those who die suddenly and without warning not only never die (in the sense in which no man ever dies to himself), but never even think they are going to die soon. A man knocked to pieces by a passing train while greasing wheel-boxes does not even leave off greasing wheel-boxes so far as he is himself concerned, but goes on greasing them for ever and ever for such an infinity of time as is practically no time at all. Or how about one who eats a good dinner and goes to sleep after it...

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