• Hunter gather braid
• Good things Altruism and empathy
• In-grouio, outgroup leading to prejudice doesnt work well today
• invertabrits have neural nets, not brains
• Evolutionary Timeline

Mech of Evolution

• Dog breeding
• Smth like that happened like that in white, natural selection
• Blonde hair originated 10-15k years ago in Scandinavia
  • Natural selection implies this provided benefit
  • Blonde skins help people obtain vitamin D from weak sunlight
  • Blonde hair becomes less frequent outside of Europe
  • some think itll disappear bc its recessive
• Brain and spine on Dorsal side
• Neural Net on Ventral side
• Chordate
  • The nervous system runs along the dorsal surface of the animal.
  • The nervous system is centered in the head.
  • The nervous system is protected by bone.
  • Cerebrum and Cerebellum
• Cost associated with bigger brains means further growth unlikely
• Big brains for processing social environment
• They got big relatively fast compared to other evolutionary changes