This is about the process of invention. I don't claim that anything mentioned here is original, although I did think of two of the examples independently - big deal!
Invention and development really occur in several stages. The first three in my list are entirely mind games.
(1) The initial idea.
Example (a) Enhanced radiation weapon. A bomb that kills by radiation, without a huge blast that destroys property.
Example (b) Space lift (elevator). A lift cable dangling from a geostationary satellite, up which lifts can climb, thereby dramatically reducing the energy required to reach space.
Example (c) Heavier than air flying machine. A mechanical bird.
This stage is relatively easy: such ideas are obvious to anyone with even superficial knowledge and understanding. It might be regarded as an inventive step, but you probably wouldn't get a patent on it on grounds of "obviousness."
(2) Possibility check.
Does the idea contravene any known natural laws? Nev