'(<a href="http://www.j-archive.com/media/2008-03-28_J_21.wmv">Kelly of the Clue Crew demonstrates with a coffee can & an inclined plane.</a>)  A ball of clay inside the can is enough to reposition the can's natural center of this, so the can rolls uphill'
gravity
SCIENCE: A ball of clay inside the can is enough to reposition the cans natural center of this, so the can rolls uphill
A ball of clay inside the can is enough to reposition the can's natural center of this, so the can rolls uphill
A ball of clay inside the can is enough to reposition the can's natural center of this, so the can rolls uphill
SCIENCE
gravity
SCIENCE