Notes: Brand New Item. Not shipped to AK, HI, APO, FPO, AE.
A lily pond, so the French riddle goes, contains a single leaf. Each day the number of leaves doublestwo leaves the second day, four the third, eight the fourth, and so on. Question: If the pond is completely full on the thirtieth day, when is it half full? Answer: On the twenty-ninth day.
![The Twenty-Ninth Day: Accommodating Human Needs and Numbers to the Earth's Resources [Paperback]](/itemImage/2/9/4/9/2_6679546.jpg "The Twenty-Ninth Day: Accommodating Human Needs and Numbers to the Earth's Resources [Paperback]")