Conversation so far:
What is unique about the Plain Indians' culture?
The Plains Indians lived in teepees because they were easily disassembled and allowed the nomadic life of following game.
what game did they hunt?
CANNOTANSWER.
What were the differences between men and women in their culture?
CANNOTANSWER.
What differences are there in Indian culture and European culture?
not yet obtained horses.

Question: What is fascinating about their culture?
Self-contained rewrite: What is fascinating about the Plain Indian's culture?