Science fiction is fascinating because it allows the reader to go on journeys into other worlds. These worlds can be unique and astonishing. Many are very different from one another. For example, Nethergrave and A Sound Of Thunder contrast each other greatly.
Nethergrave begins in the real world; the one we are familiar with. It follows an awkward teenage boy, Jeremy, through a day in his life. He then is sucked into a new virtual world, and this is where the sci-fi aspects become more prominent. Everything is digital but he describes it all as feeling real and he can control it all without a mouse or keyboard.
At the same time, A Sound Of Thunder is completely disparate from Nethergrave in the sense that none of it takes place in the world