From 2013, close up images of tears generated by different causes: onion, laughter, joy, pain, and sorrow. “Tears from each of the different categories include distinct molecules as well. Emotional tears, for instance, have been found to contain protein-based hormones including the neurotransmitter leucine enkephalin, a natural painkiller that is released when the body is under stress.”

The Microscopic Structures of Dried Human Tears

The Microscopic Structures of Dried Human Tears

Photographer Rose-Lynn Fisher captures tears of grief, joy, laughter and irritation in extreme detail

smithsonianmag.com

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