Richard Land has written that from what is known about human biology it is highly unlikely that evolution has provided humans with ESP as research has shown the recognized five senses are adequate for the evolution and survival of the species. Michael Shermer in an article "Psychic Drift: Why most scientists do not believe in ESP and psi phenomena" for "Scientific American" wrote "the reason for skepticism is that we need replicable data and a viable theory, both of which are missing in psi research."