The small, light bits, like pollen and seeds, or tiny fish or bird bones float to the top of the water where they are skimmed off and allowed to dry. Archaeologists then look at them under a ...

Alfaro, Laura, Rafael M. Di Tella, and Ingrid Vogel. "To Float or Not to Float? In Pursuit of the Chinese Dream." Harvard Business School Teaching Note 706-060, May 2006. (Revised November 2019.) ...