How many great-great-great-great-grandparents do you have?

A) 81
B) 72
C) 64
D) 121

The next time you are feeling rather unimportant, try an arithmetic trick based on the indisputable fact that it took two people—your parents—to get you here. Each of your parents has two parents, so in the generation just prior to the generation of your father and mother, there were four people whose pairing contributed to your existence.

You are the product of 8 great-grandparents, 16 great-great-grandparents, 32 great-great-great grandparents, etc. Continue multiplying the number by 2. If you figure an average of about 25 years between each generation, you will discover that only 500 years ago there were 1,048,576 people on this planet beginning the production of YOU!