Susan, IR = infrared (the amount of heat something is giving off, basically), which used to require expensive film but now can be done with digital cameras. When the results show in color you get a very bizarre (but useful) photo:

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Image for post

When the results are in b&w it’s just kind of eerie:

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Image for post

White is cooler, black is warmer, so trees show the cooler leaves and warmer trunks.

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