Throw ten coins onto a flat surface. Move aside all the coins that landed tails-up. Collect the remaining coins. After tossing them once again, remove all the coins that landed tails-up. Repeat this...

Throw ten coins onto a flat surface. Move aside all the coins that landed tails-up. Collect the remaining coins. After tossing them once again, remove all the coins that landed tails-up. Repeat this process until all the coins have been removed. Can you see how this relates to radioactive half-life? In units of “tosses” what is the average half-life of 25 coins? 50 coins? 1 million coins?