What is proof? Can we consider all types of proof? There are proofs only for reasons, but not as something you can see and touch. This is the reality of existence.
Reason 1: IndividualityWhere does individuality come from?
Every newborn is unique. There must be the condition and the materials as the causes of individuality. Individuality is what keeps us who we are as different individuals to see one being different as a metaphysical being. Individuality is about consciousness and self awareness separating us from plants. It is about self and one who feels. We are unique in terms of feeling oneself and not others as pain and pleasure - as the six senses: the five senses and the thought sense. (Thought sense can perceive memory and take the information for pleasure and pain. This is a different subject to be considered separately.)
Every newborn come from an egg and a sperm. We come from the first cell. Everything that makes a person is from the first cell as the merger of sperm and egg. Individuality must come from sperm and egg too. By taking this as fact, we have to search for all the information (that make an individual) inside the sperms and egg. We must prove individuality exists in sperm and egg. Sperms do have individuality.
Is the individuality of sperm the individuality of a newborn?
A newborn has far more complex system, intelligence and feeling especially in human. All sperms seem to have similar intelligence but far inferior to the newborns. Their intelligence seem to have only one function, to go to the female egg. They seem to be only the level of cells' intelligence for specific function. Cells do have individual tasks and as if acting intelligently and individually, especially the cells of immune system that can mistakenly attack the host's cells or friendly cells and causing illnesses. Actually cells are quite independent although have to rely on the nutrient supply by blood cells. A newborn body act like an ecosystem.
Genes are built to be unique inside the merger of a sperm and an egg. Genes are information. They must contain the information for individuality. Can the first cell have all these information inside it as genes or any other thing? If the first cell has all information, we must find them: where they are inside the cell and how they are there to become a complex system.
How does the first cell build itself different organs and assemble them all as one?
All these questions must be answer with proofs. The reason is these information can come from the individual died from the previous life - as a hypothesis. This can't be proved beyond above explanation but can only be maintained as a enigma that needs scientific challenge.
Reason 2: Ability and IntelligenceEven twins are different. No two are alike.
People are different for having different tendencies as passion, like, dislike, choice etc as mental condition, and look etc as physical condition. And also their ability and intelligence are different for being able to perform certain tasks or not. Therefore, we are different in terms of mentality, physicality, and ability and intelligence.
Again this has to deal with the first cell (the merger of sperm and egg) and information stored in it for individuality. Ability and intelligence indicate the information must have come from previous lives. Rather lives than life because consider Einstein and his ability and intelligence. His ability and intelligence are unique that couldn't be built within a single past lifetime for a few reasons. There was no such education but if he was a scientist as Sir Isaac Newton, Galileo Galilei, ... Who knows?
Kindness, empathy, bonding, fear, loneliness, nostalgia, and other kinds of intelligent mentality can be found in all of us - just the same. Chimpanzee and Puma are two friends can be friends to humans too. It can be evolution, it can be rebirth, it can be just natural law and it can be all above as the same thing. Evolution and rebirth don't have to be different. Being reborn to evolve is possible.
What is intelligence by the way?
Why is your view right and not mine? Why can't we both be right?
Intelligence needs consciousness. Can we say a dead person is still intelligent because he is only dead and all his body parts are intact? If computers were built with human brains to run the robots, would they have individuality with the view of self: I am, I exist, I'm different, I feel, and everything that follows after ego?
What if a computer was built with two or more brains? And what if one was of a human male and one was of his pet cat?
Intelligence can never be artificial because it needs the view of self and the pleasure in success, gain and possession. Intelligence is a phenomenon only to be experienced and it's beyond explanation. We cannot explain how everyone has mind. One can only know one's mind as experience. Knowing and judging are mind. Mind is intelligence. The two are the same.
We cannot prove rebirth as if it were as simple as 1+1=2.
We cannot see a black hole directly. We can only know it by seeing light and clouds around it. If we were to dismiss all the phenomena happening around the black hole, we have no chance to prove it.
We can prove we have mind by being alive and not dead. But why can a cat predict death?
Reason 3: ExperienceHow can we explain if we saw a ghost or a UFO?
Let's try to explain the taste of mosquito bite! A type of mosquitoes are really large and they can make a sharp pain to agitate you. The feeling is like someone pulls out your body hair slowly (sort of). A type of mosquito is very small and you barely notice it. But you will certainly notice when the itch grows gradually. Do you understand what I'm saying? Can you believe me?
If you don't believe me, I don't believe you when you get a headache. People claim they have headache as if I have to believe they saw ghosts. You don't have to believe me that I did saw an individual who suddenly appeared as a white entity and scared the barks out of the dogs and made them chase him/her. After that entity disappeared, as if nothing happened at all, the dogs went back to their spots. That evening was just another evening.
Can we explain our experience only to those with open minds or who had the same experience? Should we only explain about headache to the people who have headache too? The world is like that. Like minded people group together for a reason that people are not open minded.
When children talked about their past life experience, they became to have false memory.
False memory! What is it? How does it get into someone's head?
And how does a man make a woman voice to make himself to be Hearing Voices? We do have different types of mental illnesses. But how do we know all hearing are just mental illness?
If false memory does exist, can false ability exist too? If a cat can predict death, why can't a human? Yes, humans can do something different - watch Superhuman series. If the memory of Einstein was also false memory that became useful for human race by chance, should we still consider it false memory? How can we prove it was not?