Reincarnation
Strictly speaking, in the world of science an observation and a logical inference based on that observation does not make it a scientific theory. For a scientific theory, it is necessary that the theory is falsifiable. Reincarnation is therefore not a scientific theory. There can be several other explanations for the phenomenon, and until it can be established that a particular explanation sufficiently explains the data beyond a reasonable doubt, the observations will be subject to further research. From the Islamic perspective, we know that when a person dies, they shall only be raised again on the Day of Judgement. This information has been given to us by the Creator Himself, and unless we have sufficiently tested scientific explanation in favor of reincarnation, we should not have any reason to believe it.