I'm going with the lightning rod. Granted, metalworking was probably discovered somewhere in the Levant. But the "West" has only been defined by the Bosporus si

I'm going with the lightning rod. Granted, metalworking was probably discovered somewhere in the Levant. But the "West" has only been defined by the Bosporus since about 1300. Bonus: India - place-value numbers; China - paper money.