nature can't stop evolving eyes. And those eyes are incredibly varied: just look at some of the varied and bizarre eyes on animals like sea urchins, vultures or dragonflies. But scientists have ...

Charles Darwin, on the other hand, thought that the production of tears (the act of crying notwithstanding) was merely a useless side effect of the way that the muscles around the eye worked.

It's hard to imagine a more common stressor for new parents than the recurring riddle: Why is the baby crying? Did she just rub her eyes—tired ... Its sporadic nature can make it yet more ...

Andrew Feustel, an astronaut, got soap in his eye and started tearing up. In his words, “my right eye is stinging like crazy” which really sucks because in space, tears “don’t fall off of ...