How to make a fire using just a Coke can and a chocolate bar. You use the chocolate (which is a minor abrasive) to polish the underside of the can into a mirrored surface shiny enough to focus the sun's rays effectively.
How to make a fire using just a Coke can and a chocolate bar. You use the chocolate (which is a minor abrasive) to polish the underside of the can into a mirrored surface shiny enough to focus the sun's rays effectively.
