How does cancer work?

Healthy cells grow and die off at a constant rate. Cancer cells divide out of control, interfering with normal body processes.

Participants learn some facts about cancer by answering true/false questions. The reward
for their efforts: sticky cancer cells! The cancer cells can then be thrown at the "lungs" of someone who smokes, or at the lungs of a nonsmoker. See where the cells are more likely to stick!