tag:techtv.mit.edu,:Array/186903160 2007-04-26 00:14:35 -0400 Doctor Doctor <p>The Doctor Doctor duo performs a simple high school science experiment on a much larger scale. Watch as a 55 gallon steel drum implodes.</p><p> Water inside the steel drum boils into steam. It takes only 0.2 Litres of water to fill the whole 55 Gallon drum with steam! </p><p>When the sealed barrel is placed in ice-water, the steam cools and condenses back into water. Because water takes up 1/1600th the volume of steam, a strong vacuum forms inside the air-tight drum. Without internal pressure to conteract the pressure of the Earth's atmosphere, the drum is crushed from all sides.</p><p>Don't forget the very important Steam Dance!</p><p>Shot as a silent film with two humorous mad scientists running through the set up.</p><p>http://www.frogwatcher.com/doctor</p> 61 tag:techtv.mit.edu,:Array/186816340 2008-01-27 18:36:11 -0500 chosetec Arts and Crafts at MIT presents: <p>How to make a sword. <br /> with Brian Chan </p><p>In an upcoming video I will show you how to create a sword from scratch. Take your scrap steel and make something useful. We will go over the basics of forging, filing, heat treatment and polishing. We'll also touch on the fabrication of metal and wooden fittings to complete your sword. </p><p>Written and directed by Brian Chan <br />All swords shown forged by Brian Chan <br />Music by Seth Friedman </p> 55