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1 .This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 .When I was in college, I worried about exams and how I was getting home from the pub.
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3 .When Isaac Newton was an undergrad, he came up with a theory of how water moves through plants, 200 years before botanists figured it out for themselves.
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4 .That's according to an article in the journal Nature by David Beerling of the University of Sheffield's Department of Animal and Plant Sciences.
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5 .Beerling writes that between 1661 and 1665, Newton, while at Cambridge University, kept a notebook in which he jotted down musings on various matters.
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6 .Buried between sections on "Philosophy" and "Attraction Electrical & Filtration" is a half page on the subject of "Vegetables."
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7 .There, the young polymath tackled the topic of plant sap, and how it might rise from the roots to the leaves.
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8 .Newton suggested that what he called a "globule" of light shining on a leaf could knock away a particle of water, causing the "juices" of the plant to "riseth" upward.
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9 .He's loosely describing what we now refer to as the process of transpiration, in which the energy of sunlight causes water to evaporate from a plant's surface, thereby drawing water up through the stem.
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10 .Where Sir Isaac came up with this idea we'll never know.
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11 .But it suggests that before he saw that the apple must come down he was doing some serious thinking about, within the tree, what goes up.
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12 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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