Season 1, Episode 11

How Do No Tears Shampoos Work?

Air Date: 1999-11-21

Overview: How surfactant, the ingredient in shampoo that causes the burning sensation and helps rid the hair of dirt, reacts with the eye's tear film. And a look at amphoteric surfactants, which are found in 'no-tears' shampoo, and their properties.

Runtime: 30 minutes