What is this close-up picture? (WotsThat: Rubber band stretched)

Question

What object is shown in this zoomed-in close-up photo?

ThermalEdge · Accepted Answer

Rubber band stretched. The Heat Trick Stretch a rubber band and quickly touch it to your lip—it'll feel warm! This happens because stretching aligns the polymer chains inside the rubber, and that molecular rearrangement actually releases heat, the opposite of what most materials do when you pull them apart.

Answer: Rubber band stretched

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