I work with people of all ages, but specially children, educating them about natural sciences.
More often than I wish, I see people using "belief", "hypothesis" and "theory" as synonyms and I´m starting to get tired of it. I try to keep it simple (because I´m usually with children), explaining that an "hypothesis" is an idea you propose as a solution for a question and that you need to test it, and that a "theory" is an explanation you have evidence for and, until now, no test has rejected it.
But, why I have to explained it in the first place? When and how did this confusion start?