When a person dies according to Buddhism, the mind that has been conditioned in this life establishes itself in a new being and takes on a new personality shaped by its circumstances. This cycle of rebirth continues until one reaches Nirvana. Where one is reborn depends on their karma - their good and bad actions. Those who acted with kindness and love may be reborn in pleasant realms like the human world or heaven, while those who acted otherwise could be reborn as animals. Scientific studies of people who remember past lives provide some evidence for the Buddhist idea of rebirth.