Explain like I’m five

Why kevlar is better against bullets than steel

There are two ways to stop a moving object: you either have something hard and heavy enough to stop it over a short distance, or you have something flexible with high tensile strength that “catches” it and slows it down over a longer distance. In the case of the hard and heavy, this is what […]

Continue Reading

Why children’s shampoo is “tear free” while regular shampoo burns like all hell in the eyes

Soap is a chemical with a long, and kind of clever, molecule. One end of the molecule attracts water. The other end attracts dirt, particularly oily dirt. So when you wash stuff, the oily-liking end sticks in the oily dirt and the other end gets stuck in water… and so the oily dirt gets pulled […]

Continue Reading