Scientists use the metric system exclusively even in America. After graduating with a biology degree I sure know that 2.5 cm is one inch and 5ml is a tsp. Funny though…just like a foreign language I still relate it back to units I am more familiar with. Well except I don’t know how many quarts are in a 2L bottle of soda!
It was funny to talk about how when I was in school going metric was a big deal and now I can’t remember the date that the US was going metric! Well America made it as far as the 2 liter bottle and said, “That’s it! No more!”