13.About 200 years later, in the twelfth century, this parchment manuscript became a palimpsest when a scribe used the parchment to make a prayer book.
15.They simply erased the ink off the parchment and wrote something new in its place A manuscript page that was written on, erased and then used again is called a palimpsest.
16.It wasn't until 1906 that a scholar came across the prayer book in a library and realized it was a palimpsest, and that the underlying layer of text could only have come from Archimedes.
17.Uh, the palimpsest then went through some more tough times, but eventually it ended up at an art auction, where it was bought and then donated to an art museum in Baltimore for conservation and study.