Many things can emerge at different times. > Many of them are retired or near retirement, typically with a background in engineering or a related industry I h

Many things can emerge at different times. > Many of them are retired or near retirement, typically with a background in engineering or a related industry I have heard there is such a thing referred to as "the retiree's patent" -- presumably not fantastically market-worthy, but motivated in part by desire to make a difference or leave a mark.