posted Feb 5, 2012, 8:26 PM by Taeko Onishi
updated Mar 18, 2013, 4:05 PM by Jesse Alexander
Teams of 8th graders all created marble runs to study the effects of gravity. Their goal: to have the marble get to the bottom in the longest amount of time possible. The winners' marble took 48 seconds to travel a vertical distance of 45 centimeters.