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I didn't say developing an existing idea was easy, I just said it wasn't entirely original; that all ideas are the result of breeding between existing ideas is no measure of how hard are to develop!

Not so. Having an idea isn't easy. Relativity was "just" an idea long before there was any practical application of it, and it was "just an idea" that took a lot of work. It's simply not true that ideas are easy but practical application is hard. Actually the reverse can be true, sometimes an idea can take a lifetime to develop while the practical applications are trivial by comparison. Nor is it true that "Ideas and theories only prove their worth when something practical is done with them". This one really sends me actually! There's currently no application for theories of black holes, but those theories are worthwhile in their own right, for if there's anything that makes humans worthwhile, it's their ability to conceive of such ideas as black holes. Physics and mathematics, art and music are valuable in themselves regardless of practical application because they are edifying, beautiful, they are something we can be proud of amidst all our failings as a species. So if we wipe ourselves out, by nuclear weapons or some such stupidity, or if we are wiped-out by an asteroid, even if we never reach Mars, future intelligences may find our writings and movies and learn that we dreamed of going to Mars.

The other thing is that these kinds of "misunderstood heroic ignored genius" tales are complete bollocks. In reality there was always an existing idea out there before these "revolutionary innovations".

For example, people had been imagining flying for millennia before the Wright brothers. Leonard da Vinci had drawn hang-gliders and helicopters hundreds of years before and there was the myth of Icarus thousands of years before that. Our distant ancestors even "flew" through the trees. People also have flying dreams, before they've even flown in reality and they probably had flying dreams thousands of years ago too. It's not a new idea so no wonder people weren't that amazed when the Wright brothers flew. There are never any truly new ideas, only remixes and hybrids of existing ones, e.g. Relativity was Einstein's synthesis of ideas from (among others) Poincaré and Lorentz and you can trace their ideas back too.

10MB vs ~4GB for LaTeX ? a) how much of LaTeX functionality does SILE cover and b) why is LaTeX so heavy ?