Why Do Onions Make You Cry?

Onions make you cry because the chemical irritant known as syn-Propanethial S-oxide is released into the air during slicing. When this irritant comes in contact with the cornea – the front surface of the eye, it is detected by the central nervous system and eventually causes the lacrimal (tear) glands to release tears in order to wash the irritant and neutralize the effect.

It's The Pee That Causes Red Eyes In The Pool, Not Chlorine

It’s Pee That Causes Red Eyes In Pool, Not Chlorine

There has been a common misconception that the chlorine in a swimming pool makes your eyes red and itchy after a swim, but a new report from the Centers for Disease Control and Prevention (CDC) confirms that it's the pee. In collaboration with the Water Quality and Health Council and the National Swimming Pool Foundation … Continue reading It’s Pee That Causes Red Eyes In Pool, Not Chlorine