If we get a question like that how do we answer it? First, We need to know that the meaning of reincarnation is reborn into this world. Some people believe it and some don’t. Now, how it can be proven. There was a story from a monk, to prove the truth of reincarnation as scientific is through hypnotic. With this method, the person in hypnotized condition will be able to talk with honest, far beyond limits of consciousness, because the memory of subconscious brain is broader than the conscious brain.
Have you ever heard, if someone in hypnotized condition will tell lies? If he really in the condition like that, how could he lie. And he must be tell the truth. There, he will also tell about his experiences in the past that he can’t even remember.
If this thing can be a scientific thing, why some people still don’t believe it. If we live only once, is God really fair? Of course not. Not always we live in this world bring the fate A, not also we live forever with the fate B. In this life we may be born with bad destiny, but in the next life we will be born with better destiny, maybe. With something like this we know that God is fair.