Yes. Various air-powered vehicles have been tested, including some utilizing compressed air. Search for the name, AIRPod to find such a vehicle from Zero Pollution Motors to learn more.
A scientist uses the information as a beginning for solving a problem.
Scientists
Because the smoke detector uses power while trying to detect smoke.
scientists
A collecting net often is used by scientists to collect insects. It is a good tool to use for those who are trying to find different species for research and other uses.
better energy sources for the upcoming future. an example to further study in trying to save the earth
You can make cakes and bread, lots of things...
Scientists and kids for their work
Both.
nifes and folks
assiting in scientific conclusions
Scientists believe so but we would have to have a room full of equipment. As a matter of fact, Berkley scientists have created a working plasma arc generator, which behaves quite a lot like a lightsaber. But, as mentioned above, it's difficult to make it handheld, as it uses immense amounts of power and takes a large machine to function.