What is this close-up picture? (WotsThat: Popcorn kernel)

Question

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

ZirconBlade · Accepted Answer

Popcorn kernel. Popcorn kernels pop because they contain a small amount of water inside a hard shell. When heated, this water turns to steam and builds pressure until it explosively bursts open, turning the kernel inside-out in a fraction of a second.

Answer: Popcorn kernel

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