Even large ships weighing hundreds of thousands of tons stay afloat. But how? Investigate floating by building tinfoil boats and loading them with pennies until they sink. Discover how a boat’s size and shape make a difference in how much of a load it can carry. Time to roll up the shirtsleeves and dive in! Sponsored by Middlesex Savings Bank, with additional support from Red Hat, Inc. © 2011 WGBH Educational Foundation.