Can you solve why dinosaurs died out? Can you prove how extinction came about? All you need to do is find the last dinosaur and bring back a tooth to prove you found the answer.
The Time Machine series is kind of like Choose You Own Adventure books, but lacks the younger versions' logic loops (that you can sometimes get trapped into) and death scenes. You can't die in a Time Machine book and your choices have effects that seem to be logical. You also end up learning alot even as you flee giant flesh-eating dinosaurs.
