What does the author mean by head start? Which continent do you think had an advantage in11,000BC? Why?

The term "head start" typically refers to an advantage or a lead in a certain situation. It means that one has an early start or an initial advantage over others, which can be due to various reasons such as resources, knowledge, or location.

As for the second part of your question, it's hard to determine which continent had an advantage in 11,000 BC without any specific context. However, if we refer to Jared Diamond's "Guns, Germs, and Steel", he argues that Eurasia might have had a "head start". This is due to its large land mass, diverse climate, and a wide range of flora and fauna. These factors could have led to early developments in agriculture, animal domestication, and eventually, advanced civilizations.

Please note that this is a general interpretation and the specific context or source might lead to a different conclusion.