While most people throughout history have believed that we are both physical and spiritual beings, the rise of science has called into question the existence of the soul. Many now argue that neurophysiology demonstrates the radical dependence, indeed, identity, between mind and brain. Advances in genetics and in mapping human DNA, some say, show there is no need for the hypothesis of body-soul dualism. Even many Christian intellectuals have come to view the soul as a false Greek concept that is outdated and unbiblical.