What is the most useful human invention?

uhm, pretty difficult to answer coz' there's so many of them which are useful. But if I only given chance to choose one and just one only then my answer would be "the internet". I don't think that I need to explain this since it's quite obvious that a lot of things has changed by this invention. Back then it would take time for us to know what's happening on the other side of this world but it's now can be easily accessed, read, heard or even viewed using this technology. Anyway, Mylot wouldn't be available if there was no internet and therefore I wouldn't be ended up here seeing you along with this question. Nice one, actually.

The Toilet. If you into another country, place, house, always look for a toilet. There's nothing worse than running around the public like a penguin holding it in...

No one had mention fire yet, maybe they don't consider it and invention but certainly the ways of making it are. But perhaps the printing press would be equal to many because it made for the spread of knowledge which could be used by others to help them dream up their inventions.

fire!!!(think about it!)

well dont want to be called old but its the wheel haha. from the egyptian pyramids to the bicycle to our everyday lives we use some sort of a wheel.

I have to go way back and say the wheel and axle. With out this simple invention many other items would have never been invented. Just think of all the things associated with this. Cars, wheelbarrows, pulleys, carts, many machine parts and the list goes on. It is amazing how many thing are based off a simple consturction that we never think about.

As we enjoy it! i love the www. but away from my PC, it is the goggles i love the most, i love to see what are the life under the water we call sea or ocean.