Do you have an invention you KNOW will someday change the world? Have you been toiling for years in your basement, building prototype after prototype to PROVE that your idea works? If so, tell us about it! Enter the fifth annual PopSci Invention Awards.
We’re looking for game-changing products that come from the passionate drive of independent inventors (rather than those born in the R&D labs of universities and corporations). PopSci editors will pick 10 inventions that best represent the spirit of homegrown ingenuity and solve real-world problems in a practical and innovative way. And we’ll show them to our seven million readers in our June 2011 issue. Check out last year's amazing winners here, and find details for entry below.
To enter, simply submit details on your invention via email to inventions@popsci.com. Here are a few guidelines:
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.


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instead of damming rivers, put multiple water-wheels along the edge that generate electricity.
"-my name here-",
Normally they dam rivers for other reasons then electricity.
The electricity is just a nice byproduct.
As in they dam to control the water so that it doesn't flood people at some times/years and run dry other times/years. They dam to provide water to people instead of having it run to the sea.
Also even if you where only after electricity, you want a constant source of it. Rivers are not constant things, they are faster after the snow melt for instance and can even stop running in the summer, so to have a constant electrical supply you need to dam and then regulate the water going through the turbines.
Someone should invent a handheld radar like the ones you would see in video games, usually in the top right hand corner. It might work using sonar technology.
getrevenge32
maybe you should stop playing those video games and actually look at what's out there. the navy and air force have been trying to shrink radar for decades.
Also radar doesn't see through tree hills or buildings. The only way a foot soldier would find use is standing in the middle of an empty field.