Which team was founded and coached for decades by George Halas, known as "Papa Bear"?

Which two expansion teams began play in 1976? Which Cleveland franchise returned to the NFL as an expansion team in 1999? Which team is named after its founder and first coach, Paul Brown? Which team did Paul Brown found after leaving Cleveland? Which NFL team's helmet famously has no logo on it? Which team's helmet logo appears on only one side of the helmet? Which team's primary logo is a star? Which team uses a lightning bolt as its logo?