Perhaps the toilet should get some consideration for best invention in history, but I still say that the 29er SS has it beat. Ever seen anyone ride through a rock garden on an American Standard? Doubt it.
The telephone is also overrated. Telephones can be used to call your riding buddies, but your boss can also call you to ask you do do more work. Points off.
"How about the light bulb?" Well, the light bulb is good for night riding, but again it has it's low points. Light bulbs can burn out. Your legs may burn out on a 29er SS, but you will never get burned out on the joy of those big wheels!