Lead never leaves your body. So don't eat the solder.

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I'm not sure what to make of the "don't eat the solder" quip as such is obvious for any of us adults reading this thread. As to the "never leaves the body" remark, that is not 100% true. But it is partly true in that Pb stays in the body a long time. I recommend this short John Hopkins University Report, noting the section on page 2 entitled "How does lead get into the body?" I don't say this in defense of Pb or leaded solder. I simply state it for "the facts." Even so, it is still important to consider that Lead Free Solder = tin whiskers = potential short circuits (which is more critical a point than just to say "lead free solder is hard to work with").