Why Doesn't Sugar Spoil?

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In this video:

Two foods are left out on the counter – fresh tomatoes and a bowl of sugar. Within a week or so, one will develop black spots and the other remains pristine, albeit perhaps a little clumpy depending on the humidity of the air. The reason? Osmosis.

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Sources:

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http://www.scienceclarified.com/Oi-Ph...
http://alienryderflex.com/osmosis/
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