nothing lasts—including us. We and everyone we love will die. Fame fizzles, beauty fades, continents shift. Pharaohs are swallowed by emperors, who fall to sultans, kings, kaisers, and presidents—and it all plays out against the backdrop of an infinite universe in which our bodies are made up of atoms from the very first exploding stars. We may know this intellectually, but on an emotional level we seem to be hardwired for denial. We comport ourselves as if we had solid ground beneath our feet, as if we had control.