Structure of tears influenced by what makes us cry

Photographs of 100 tears, taken through a microscope, reveal the different images they create when we cry from sadness, pain or joy

The Microscopic Structures of Dried Human Tears, Science

Unlock the Puzzle: Why Do Eyes Tear Up During Peeing?

Why Do We Cry and What Is the Process of Crying? - HubPages

Enzyme That Makes You Cry–Crystal Structure of Lachrymatory Factor Synthase from Allium cepa

Teary-Eyed Evolution: Crying Serves A Purpose : NPR

The Microscopic Structures of Dried Human Tears, Science

Why it's so hard to ignore a baby's cry, according to science

The importance of tears for eye health

Watch We Shall Remain, American Experience, Official Site

Teary-Eyed Evolution: Crying Serves A Purpose : NPR