12

This is probably Theodore Sturgeon's "Microcosmic God" (1941), where the main character creates a little world and forces the beings inside - called Neoterics - to evolve and solve problems for him. This, then, was the answer to his problem. He couldn't speed up mankind's intellectual advancement enough to have it teach him the things his ...


8

This is Time Trax. In the year 2193, over a hundred criminals become fugitives of law enforcement by traveling back in time two hundred years to a parallel Universe, using a time machine called Trax. Darien Lambert is a police detective of that period who is sent back to 1993 in order to apprehend as many of the fugitives as possible He [Darien Lambert] is ...


2

This sounds like The King of Cave Will Live a Paradise Life. Hiel was ridiculed for having a useless crest and was exiled to a remote island. When he grabbed an pickaxe to reclaim the island, the true effect of his crest was revealed. With his production cheat he will reclaim this uninhabited island and start his life in paradise. Found with a search for ...


2

Some central aspects (a race that modified itself to become floating spheres) match a race in "All Tomorrows", by C.M. Kosemen, an SF work (not a novel, but a future history told through an illustrated catalogue of bizarre future races) which does not mention the traveling protagonist you described, but among the descendent races of humans ...


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