TEARS are a kind of liquid sandwich, comprising a watery, salty middle layer trapped between an outer layer of oil and an inner layer of mucus. The oily outer layer is secreted by glands inside ...

Tears are made up of three layers: a mucous, watery, and oily layer, each of which comes together from separate glands. When the gland that produces the oily layer doesn't function properly ...

The Cherokee people called this journey the "Trail of Tears," because of its devastating effects. The migrants faced hunger, disease, and exhaustion on the forced march. Over 4,000 out of 15,000 ...