I bet you didn't know that one way of helping kids understand the concept of a half life is by using pennies. But you can...first you take 100 pennies and place them in a bag. Spill the pennies out and take out all the heads. (close to half--or it should be...this also helps students realize that not everything always works out perfectly).

Then you take those out..place the remainder in the bag and do it again and again until you run out of pennies. Of course you are keeping track of how many heads you remove each time. The kids see that, WOW, almost always 1/2 of what you have.

So cool...enjoy the pictures of your cute kids.