What scientific photos are hard to believe but are indeed real?

What scientific photos are hard to believe but are indeed real?

Each of the V-shaped structures is a collection of stiff hairlike protrusions that bend back and forth in response to vibrations from sound pressure waves. The three prominent rows show the hairs of the receptor cells that detect very weak vibrations and amplify them so they can be better detected by the cells in the single row which is just visible along the top of the image. These are the cells that send acoustic information to your brain. In any case, all of these cells work together to enable normal hearing sensitivity…

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