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The air that surrounds us is about 20 percent oxygen, though this was unbeknownst to the ancient Israelites. In fact, they seemed to have been unaware of the concept of air at all since they didn’t have a word for it. The Hebrew word for air,avir (a-VEER), only enters Hebrew in Talmudic times, and comes from the Greek word aer, which is also the origin of the English word (through...