January 4, 2019

Why do I cry?

That depends on the kind of crying you’re talking about. Our eyes produce tears of three types… Basal tears flow constantly to keep our eyes from […]
January 4, 2019

Why do I blink?

Humans blink automatically to flush away the stream of cleansing tears produced by ducts in the corners of our eyes. Adults blink about 15 times per […]
January 5, 2019

Why do some people need to wear glasses or contacts?

Your eyes are amazing machines, but it takes only one small imperfection in the shape of your cornea or the lens of cause fuzzy focusing. Doctors […]
January 5, 2019

Why do I have 10 fingers?

Scientists have several ideas why humans can high-five each other instead of, say, high – four or high – six. One theory suggests four fingers and […]