With reference to the time paradox thing. I liked how they fixed it in Dirk Gentley's Hollistic Detective Agency, where at the end of the story the protagonist asks his time traveling friend "But didn't we just create a load of time paradoxes?" and the time traveller essentially says 'no, the universe just ignores paradoxes'
If you're looking for a book this summer i reccomend this ^. its a really funny book by Douglas Adams (the guy who wrote Hitchhikers Guide to the Galaxy).
If you're looking for a book this summer i reccomend this ^. its a really funny book by Douglas Adams (the guy who wrote Hitchhikers Guide to the Galaxy).