What is the cost of a human life?
People are alive today that would not have been from medical tech derived from NASA human spaceflight.
You may even know someone.
Come on dude, you can google this stuff as easy as me...
http://www.google.com/#hl=en&source=hp&q=NASA+spinoffs&aq=f&aqi=g10&oq=&fp=a048890d3c90c6fc
That is if your really interested in the facts on the matter. Go have a look.
By the way Tang was not invented by NASA, that is urban myth.
That's my point; you didn't reel off a few, you had to look them up, because it's iffy stuff. Twenty-four products NASA claims as spin-offs" includes 'Portable Cordless Vacuums', for example.
I must tell you I am doubtful we would not enjoy the cordless vaccum without NASA's efforts.
BTW, Tang didn't sell until it was used on Gemini flights, so it became popular because of NASA's use.