What is this close-up picture? (WotsThat: Walnut shell cross-section)

Question

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

ZirconBlade · Accepted Answer

Walnut shell cross-section. When you crack open a walnut shell and look at the cross-section, you'll notice it has a surprisingly labyrinth-like internal structure with multiple chambers and walls, almost like a tiny brain—which is why walnuts have been associated with brain health in folklore for centuries. This intricate architecture isn't just for show; it evolved to protect the developing nutmeat while being thin and light enough for the tree to disperse easily.

Answer: Walnut shell cross-section

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