Very good post. Magnesium block is not as easy as you might think, but still very simple. Let me clarify... It is very simple, but you might have to try it a couple times to figure out how much magnesium to shave off and start (it really depends on the quantity and quality of your tinder to be honest). I found out about magnesium blocks when a friend let me use his to try it out.

Unfortunately, answer to number 4 is wrong. It is really a simple answer if you think real hard about it. I will wait and try to let others guess before I give the correct answer (not being a punk, just want to let others try too).