Information transmission

Perhaps nothing has changed so much as the speed with which we can transmit information. A letter carried on horseback 150 years ago would have moved information at a rate of about .003 bits per second (the average note carrying, say, 10 kilobytes of data, though of course that measure didn’t yet exist). As late as the 1960s those same 10 kilobytes might have moved at 300 bits per second. Today global telecom cables transmit at a rate of billions of bits per second, a many-billion-fold increase in speed over 150 years.

The Age of the Unthinkable, by Joshua Cooper R.