Part 1 of 5 · freeIntroduction
Every autumn, forests turn from green to gold, copper, and purple. This is not a matter of taste. It is a strategy: the tree takes back what it can before dropping its leaves for winter.
The warm colors do not appear out of nowhere. Often they were already there, hidden under the green. To understand autumn is to understand a huge biochemical cleanup.
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 2The green that hides everything
- 3The real trigger: nights that grow longer
- 4Where the bright reds come from
- 5Why some autumns blaze brighter
Open-book quiz8 questions whose answers are in the text.
Glossary9 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
