http://www.instructables.com/id/Vacuum-Cannon_1/ Instructions on how to make a vacuum cleaner into a cannon.
http://www.primitiveways.com/fire_from_ice.html Starting fire with a lens made of ice.
http://www.instructables.com/id/Vacuum-Cannon_1/ Instructions on how to make a vacuum cleaner into a cannon.
http://www.primitiveways.com/fire_from_ice.html Starting fire with a lens made of ice.