Yuval Noah Harari is an Israeli historian and a professor in the Department of History at the Hebrew University of Jerusalem. He is the author of the popular science bestsellers Sapiens: A Brief History of Humankind (2014), Homo Deus: A Brief History of Tomorrow (2016), and 21 Lessons for the 21st Century (2018). His writings examine free will, consciousness, intelligence and happiness. Harari writes about the "cognitive revolution" occurring roughly 70,000 years ago when Homo sapiens supplanted the rival Neanderthals, developed language skills and structured societies, and ascended as apex predators, aided by the agricultural revolution and accelerated by the scientific method, which have allowed humans to approach near mastery over their environment. His books also examine the possible consequences of a futuristic biotechnological world in which intelligent biological organisms are surpassed by their own creations; he has said " Homo sapiens as we know them will disappear in a century or so".