What You Need:
- A coin to flip
- Open space
- Go out to a large open field and mark a spot on the ground. Take a coin. Stand on the spot and flip the coin. If the coin comes up heads, turn to the right and take a large step. If the coin comes up tails, turn to the left and take a large step. Keep doing this many times and see where you end up.
If you flip the coin 25 times, you will probably be about five steps away from where you started. When you try this, you will notice that sometimes you go much farther than you expect and sometimes you end up very close to where you started. But if you repeat it many times or get several of your friends to do it with you with coins of their own, the average distance will always remain the same. This experiment is an example of how science can often predict what will happen on the average even when the process is random.