I was busy plugging KSP on another site (it had suggestions about learning rocket science for sci-fi.  I pointed out KSP cranked up "rocket science" smarts faster than anything else.  I wanted to include a demo (for cheapskates or simply the chance to try before you buy), but it looks like the demo no longer exists on the Squad site nor Steam (I *think* Squad's demo was the ancient, pre-cost KSP with mods disabled, while Steam's was 1.0.0 based.  No idea why they were different). I hope thi