Reddit has a number of these, e.g. /r/askscience for general science explanations, /r/answers for “everything you ever wanted to know about anything but were afraid to ask.” There are other specific Q&A subreddits for history, social science, and estimation of unusual quantities.
Reddit has a number of these, e.g. /r/askscience for general science explanations, /r/answers for “everything you ever wanted to know about anything but were afraid to ask.” There are other specific Q&A subreddits for history, social science, and estimation of unusual quantities.