4. 17 blinks in a minute
On an average, a human eye blinks 17 times in a minute.
5. Tears have different compositions
The composition of your tears depends on your situation. It has different compositions when you’re crying, laughing hard and yawning.
6. Use of Eyebrows and Eyelashes
Eyebrows prevent dripping of sweat into the eyes and Eyelashes protect them from dirt and dust.