(Kelly of the Clue Crew demonstrates with a coffee can & an inclined plane.)  A ball of clay inside the can is enough to reposition the can's natural center of this, so the can rolls uphill
But can an object, without any external or internal source of energy, climb 
up an... [DOC] [TLE] The Bugis - The OXIS Group [PAR] my stay at the Social Science Training Centre of Ujung Pan clang and ..... this 
book the older names 'Insulindia' and 'Insulindians' will be used ... makes the 
Bugis so mobile, and lies behind another of their ... in gaining access to the 
island's natural resources and in ... Sulawesi's position between Borneo and the 
Moluccas.