Sapiens
Keep an eye on your tribe's "Happiness" and "Health" bars. If they are too cold or hungry, they will stop working.
"Imagined Reality." Unlike other animals, Homo sapiens can talk about things that don't exist (gods, nations, money, human rights). Sapiens
Assign multiple sapiens to new skills simultaneously to speed up progress. Keep an eye on your tribe's "Happiness" and "Health" bars