Why should we use the metric system in science?
Because the metric system uses units of 10's to measure which makes things simple. Conversions to the English system are a nightmare when you start talking about in depth formulas or measurements like in physics, engineering, and such.
It can be done using the English system, it's just more "clunky".
and so that person is corect but you must measure the amount of licks it takes to get to the tootsie roll center of a tootcie pop first.