In Sapiens: A Brief History of Humankind, Harari surveys human history from the evolutionary emergence of Homo Sapiens to 21st Century political and technological revolutions. Harari's follow-up book, Homo Deus: A Brief History of Tomorrow, was published in 2016 and examines the possibilities for the future of Homo sapiens. His latest book, 21 Lessons for the 21st Century, published on 30 August 2018, focuses more on present-day concerns.