Interesting Fact - Makeup

Any substance that measures less than 100 nanometers (one tenth of a micrometer) in at least one dimension can be considered a nanomaterial.

(You might think it is all science fiction, but you'd be wrong, synthetic nanomaterials can be found in cosmetics like sunscreen and make-up and, are added to food, to extend shelf life. Which means you probably have some inside you as you read this.)