Given enough time, a shell midden becomes limestone. Children of a future civilization might not find out anything about our culture or language, but they are

Given enough time, a shell midden becomes limestone. Children of a future civilization might not find out anything about our culture or language, but they are definitely going to know that we loved oysters. Meanwhile, their scientists will argue about what kind of iron-rich oysters are responsible for the remains of reinforced concrete along our prehistoric shores and rivers.