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Scientists can't agree on why some autumn leaves go red

By Nell Greenfieldboyce
Published November 4, 2025 at 4:18 PM EST

Leaves often turn brilliant colors in autumn. One of those colors has generated a lot of heated debate among scientists in recent years.

Copyright 2025 NPR
Nell Greenfieldboyce
Nell Greenfieldboyce is a NPR science correspondent.
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