I humbly submit that shoes are man's greatest invention. Just ask Tom Hanks' character in Castaway. If you were isolated and could only have one "invention", what else would it be? A house you can never leave? A fire you can not bring food to? Shoes allowed us to gather more food and all our other great ideas came from the leisure time that afforded us. I could get by without a car, or without fire, but I would be utterly miserable without shoes. I wouldn't last one day in the winter. Sure, I enjoy a good barefoot walk on the beach, but without shoes you can't even go into a store to buy groceries.