At some point in the late 10th century, a scribe copied several works by the Greek scientist, mathematician and inventor Archimedes. On the day before Easter 1229 — however, a priest-scribe completed a new work which he wrote on top of the Archimedes text, which he erased.
Don’t freak out just yet. :) Read what happened and praise luck, science and invaluable work of conservators. 

At some point in the late 10th century, a scribe copied several works by the Greek scientist, mathematician and inventor Archimedes. On the day before Easter 1229 — however, a priest-scribe completed a new work which he wrote on top of the Archimedes text, which he erased.

Don’t freak out just yet. :) Read what happened and praise luck, science and invaluable work of conservators.