Things NASA provided to Earthlings...where shall I begin?
How about wireless telephony technology - stuff than contributed to the development of cell phones?... Also, as a former vol. firefighter I gotta give props to NASA developing the SCBA air tank. And in a way, NASA has brought us on Earth in closer workings with air and space in the form of satellite communications (TV, data, internet), climate science, NASA figured out wind sheer for safer air travel, space based crop analysis, space based ocean and soil analysis, G-P-S, *accuracy* in sci-fi movies, tons of material for creative works (movies, music, imagery), etc., etc., etc.
More info: http://www.nasa.gov/ then go to the "NASA Home and City" button on the left side ~halfway down.
But probably the most important of all - since NASA is basically in the business of making longshots happen, NASA has provided us the opportunity to explore a whole new frontier that has mustered the best and brightest and inspired through the wonder of it all some of the most unique creative expression known...
My favorite sci-fi movie quote is from "Contact" - Ellie Arroway: "Some celestial event. No - no words. No words to describe it. Poetry! They should've sent a poet. So beautiful. So beautiful... I had no idea."
This one tip will help you sleep better tonight
A few seconds are all you need to get a better night's rest.