 You're going to do a lab to simulate radioactive decay. Instead of having a radioactive isotope, we're going to use pennies. You're going to put 100 pennies into a box. The pennies are going to be your individual nuclei. Close the box, give it a good shake, open the box, and carefully remove the pennies that are heads up. Once you've taken out all the pennies that are face up, count them, and calculate how many pennies are remaining in the box. Close the box, shake the box again, the second set of pennies, and calculate how many pennies are left in the box. Continue the process until you have only about five pennies left in the box. You'll construct a graph of the number of pennies left in the box versus the number of times you took pennies out of the box.