How many different words do you use in a day? Take a guess. A couple hundred? A couple thousand? I couldn’t find stats on how many different words people use every day, but I did find that adults know more than 17,000 words, whereas an average five year old knows about 1,500 words. Having so many words makes language complex and nuanced, and virtually anything can be explained. But not everything explained is understood, and science in particular suffers from an overuse of jargon.