The Twenty Ninth Day

Author/Contributor(s):	Brown, Lester Russell
Publisher:	W. W. Norton & Company
Date:	04/01/1978
Binding:	Paperback
Condition:	NEW

A lily pond, so the French riddle goes, contains a single leaf. Each day the number of leaves doubles--two 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.