Ever get tired about getting the clothes wet during rainy day when u're not in home to "save" the clothes. Let's find a solution! You now have a little container beside the clothes. When there is rain, water goes in. It gets heavy. Using a lever system, the weight of the water container can convert to a motion to close a waterproof cloth up above the clothes to prevent them from getting wet (Apologize for my bad English, I'm only a student who's not living in the USA.)

Nowaday, The US has the most sophisticated spacecraft. But it hasn't ever developed a transport that can use very little energy. To overcome the grativational force of Earth, people have to apply a lot of thrust to encounter it to go to space. But why don't we try to change things around? I believe (although seems impossible) there are two methods to propel the rocket without fuel. First, scientists can find method to stop a tiny area's gravitational force, then we can just a...