The feeling of invincibility for youth must programmed into the DNA. No way to avoid it. You just hope they make to adulthood.
One of the best quotes I ever heard on raising children was by James Dobson (before he became politically involved). He said some to the effect, " The MOST important thing about adolesence is that both parent and child survive. Anything else is a bonus."

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags