Autumn rainbows

Not – I hasten to point out – the refraction-through-a-raindrop kind. No, these are rainbows that have autumn as their root cause.

As the amount of daylight decreases and the atmospheric temperature drops, one class of trees protects itself from excessive water loss by shedding its leaves. Prior to shedding, though, the leaves undergo an amazing transformation – one that everyone knows and that everyone looks forward to as a sort of reward for putting up with the loss of summer (assuming there was a summer to lose).

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