January 4, 2019

Why are my tears salty?

Sodium chloride – the most common type of salt – is in all your body’s fluids: blood, sweat, and (yep) tears. Your tears contain a little […]
January 4, 2019

Why do my eyes sting when I swim in the ocean but not when I cry?

Because sea water contains about three times more salt than your tears. The higher concentration of salt can cause a mild stinging in your eyes even […]
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 […]