Do remember punch cards? Most of us don’t. But they were an important invention back in the day before magnetic medium. Have you ever wondered how many punch cards it would take to store all the records in Google? Assuming that Google has 15 exabytes, or 15,000,000,000,000,000,000 bytes of storage capacity. Punch cards can contain roughly 80 characters, each box of cards can hold 2000 cards. 15 exabytes worth of thin cardboard punch cards stacked would reach up 3 miles.
