Anyone may be able to explain the difference between weight and volume to a 6 year old – when to use a measuring cup or when to use a scale.
Anyone may be able to explain the metric system to a 10 year old – why kilo is one thousand but mili is one-thousandth.
Anyone may be able to make a 13 year old girl load the dishwasher – because it has to be done even when you roll your eyes.