When experimenting with fusion, why do we always go so big and make extremely expensive reactors that take years to create and even construct facilities for? I've seen some failed attempts at making fusion happen in carbon nanotubes, failing in the sense that the carbon nanotubes are just completely demolished. It makes more sense to me (I'm new to this stuff) to make small reactors that could fit in your hand or smaller to have far many more experiments conducted,had the same amount of money that's put into these massive reactors been put into a large quantity of smaller projects. Also, what's a good way to learn about the parts related to the operating, testing, and computing inside of fusion devices? Is there any place online that has tons of data directly derived from fusion devices that I can view or is all of this stuff really not published for the public eye? If I were to build a fusion reactor, what could I do to make the biggest difference possible in the world's understanding of fusion?