In Jerusalem, in the year 1229, a Greek Orthodox monk named Johannes Myronas needed parchment. Not a relic, not a treasure — just something to write a prayer book on. So he took pages that had already been used, scraped them clean, and wrote over them: prayers for the dead, prayers for repentance, blessings for the loaves at Easter. What he scraped off, Open Culture reminded us this week, was Archimedes.
Myronas wasn't vandalizing the history of mathematics. He was economizing. And by economizing — by folding those pages into a book somebody would care enough to keep for the better part of eight centuries — he preserved the very text he destroyed. The erasure was the preservation.
That accident makes a good lens for the week's reading, because a striking number of these stories circle the same uncomfortable fact: every archive is partial, and the reasons it's partial are almost never the reasons we would have chosen.