" Then there is the “intelligent” signal from outer space that has defied explanation for thirty years; the enigma of our sense of free will despite all scientific evidence to the contrary; the spacecraft that are being pushed off course by an unknown force; the trouble we have explaining the origin of both sex and death using our best biological theories … the list goes on. "

― Michael Brooks , 13 Things That Don't Make Sense: The Most Baffling Scientific Mysteries of Our Time