I would think flying would be pretty cool. You would be able to fly away from all your enemies and get where you're going much faster. But being invisible? You probably wouldn't use that for the good of man.
The military is a very cool world to write about. I went down to Ft. Benning Ga. for military training and I learned a lot about soldiers and officers and why they joined up and what their life has been like.
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Being an author of banned books is cool I've decided.