The Master Key on Instagram: "Einstein's brain was 15% smaller than average. Let that sink in for a second. The man who revolutionized physics, who gave us relativity, who changed how we understand space and time itself - had a smaller brain than most people. So what made him a genius? Scientists studied his actual preserved brain after his death and found something extraordinary. His corpus callosum - the neural bridge connecting the left and right hemispheres - was significantly more developed