Lessons
Lessons
Short and visual, with the evidence for every claim. Read them in order, or start anywhere.
| Lesson | When | In short |
|---|---|---|
| How long is human history? | 315,000 years ago to now | Our species’ whole story on one line, and how little of it was ever written down. |
| The first hands | At least 67,800 years ago | Hand stencils are among the oldest pictures people made. How we know how old they are. |
| Writing, invented four times | 3400 BC to 200 BC | Writing was not invented once and passed on. It began separately in at least four places. |
More lessons are being written and checked. Each one is added only after its sources have been read.