Activity for horse hairâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
End of the world, entropy, and a new civilization After a nuclear apocalypse, will the earth have enough time left to go back to its pre-human state? If it did, and a new civilization appeared, would it be impossible for them to know that the initial civilization ever existed (presumably enough time has passed that space objects, etc. are gone as w... (more) |
— | over 8 years ago |