Every living creature that is born grows up. But HOW do they grow, and WHY do they stop growing? Harrison finds out if girls grow faster than boys and if you can make yourself grow taller. He also uncovers the real difference between humans and other creatures, and how scientists are working to make us more like salamanders.

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The Big Question: "What would happen if you never cut your fingernails? Would they grow forever?" 1) MY GREAT CHALLENGE: “Are you my Mommy?” Challengers race to match up photos of baby animals to their grown-up parents. 2) IN THE FIELD: Harrison sees his future! The Vancouver Film School turns Harrison into an 80 year-old man!