Yuval Noah Harari’s history of humanity in one sitting, built around one idea that sticks: chimps cooperate in groups of dozens, we cooperate in groups of millions, and the trick is shared fictions. Money, nations, religions and corporations exist because enough of us agree to act as if they do. The cognitive revolution, the agricultural revolution (“history’s biggest fraud”, he argues) and the scientific one, told with the confidence of someone happy to trade nuance for reach. A book historians grumble about and everyone else devours.