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Why leaves change color: the science of fall foliage
Oct. 21, 201901:53

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mach

Why leaves change color: the science of fall foliage

01:53

It’s the most iconic sign of autumn: leaves change from green to a brilliant array of reds, purples, oranges, and yellows that all too quickly fall to the ground. But what causes this process to happen? Mach explains.Oct. 21, 2019

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Last Updated: Thursday, October 1, 2026 at 04:35 PM
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