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Iron is the most common magnetic ore, but IIRC you can also use cobalt, nickel, and some rare Earth elements.
The iron doesn't have to be particularly pure. There is a naturally-occurring iron ore, magnetite, which is magnetized.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
You're not the only one who LOL'd. But the rest of us didn't feel bad.
Government can give you nothing but what it takes from somebody else. A government big enough to give you everything you want is big enough to take everything you've got, including your freedom.-Ezra Taft Benson
You must accept 1 of 2 basic premises: Either we are alone in the universe or we are not alone. Either way, the implications are staggering!-Wernher von Braun
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
My ex has too much mass to be even close to what you'd call boyant, so I wouldn't even see her.
I would ignore the VB developer and keep walking to Burger King.
".45 ACP - because shooting twice is just silly" - JSOP, 2010 ----- You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010 ----- When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013