I have to admit that I’d always believed that we had Teflon and Velcro thanks to NASA and then recently that this is in fact a furphy! Both Teflon and Velcro were developed by people outside of NASA and later used by the space program. Though, I guess you could argue that we probably all know about them and they found commercial success because NASA made their existence and applications known.
It was the Naked Scientists podcast that set me straight on this one. Excellent stuff as always.