So soll die Zivilisation begonnen haben:
Monica Ramsey, an environmental archaeologist at the University of Toronto, Canada, and her colleagues studied phytoliths at the 22,000-year-old Kharaneh IV site in Jordan, one of the first places to show evidence of long-term residence.
To their surprise, they found few phytoliths from cereal grains. Instead, the vast majority of phytoliths came from wetland plants such as rushes and sedges. These plants yield many fewer calories than grains do, but they are available year-round, and in dry years as well as wet ones.