Explain like I’m five

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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 […]

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

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 […]

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