Explore the evolution of consciousness in this 50-minute lecture by renowned psychologist and philosopher Nicholas Humphrey. Delve into the theory of 'phenomenal consciousness' as Humphrey presents groundbreaking research and personal experiences, from discovering blindsight in monkeys to studying mountain gorillas in Rwanda. Examine the differences between sensation and perception, investigate how natural selection led to the development of sensations, and understand the purpose of phenomenal consciousness. Consider the possibility of sentience in animals, the effects of body temperature on brain speed, and evidence for consciousness in various species. Ponder whether machines could achieve consciousness and if sentient aliens might exist. Conclude by reflecting on the potential extinction of consciousness on Earth in this thought-provoking exploration of the mind.