Why is the main ingredient in making glass bottles� glass bottles? How many potatoes does it take to make a bag�s worth of potato chips? What�s the force at work providing an arc trainer�s characteristic resistance? And how do you build a boat that�s fast enough to cut through the waves at 55 miles an hour and large enough to hold 12 of your closest friends? Find out the answers to these questions and more in this episode of �Engineered With Marshall Brain.� Take a � Off The Fence 2014 2 fast-paced and fact-filled adventure into the world of product design, manufacturing and testing as we go behind-the-scenes to find out how people and machines create some of life�s most fascinating things.