In his epoch-making 1632 book Dialogue Concerning the Two Chief World Systems: Ptolemaic and Copernican, Galileo made a subtle case for how reading gives us super-human powers. Printed books were a young medium then, still in many ways a luxury for the privileged. But as the cogs of culture continued to turn, revolutionizing ideologies and technologies, making books common as daylight, the written word never lost this power. 350 years later, Carl Sagan — another patron saint of cosmic truth…