> many retirees on Social Security do return to teaching, many consider it a way to "give back". Just my five cents: If they recorded their lectures and put th

> many retirees on Social Security do return to teaching, many consider it a way to "give back". Just my five cents: If they recorded their lectures and put them on YouTube (or a similar site) much more people could profit from their teaching - thus they would give back to many more people.