| ▲ | If another advanced civilization lived on Earth before us, would we know?(cnn.com) | |
| 10 points by samizdis 13 hours ago | 1 comments | ||
| ▲ | pseudohadamard an hour ago | parent [-] | |
Of course we know about earlier civilizations, look at what the Pabodie Expedition found in Antarctica in 1930, and you think the Dresden Agreement of 1931 was signed by most major powers as a what-if? | ||