It's great - if predictable here - to see I'm not the only who doubts the wisdom fo "growing up" - assuming you can define it. I kinda like some of what Heinlen used to say abt getting rejuvinated to physiological age 19, look abt 30+ to ?? (whatever you want) & not really grow up in the usual ways, & put off growing too old for a while... then be - of course, a folksinger.. 'n a pilot, 'n a cowboy, 'n a space-ship captain, 'n an archeologist, 'n an explorer, 'n a deep-sea diver, 'n an inventer & scientist... not sure abt doctor... but I'd like to cure AIDS, CF, a host of degenerative diseases, etc, etc.. get back to the joy & delight in science, but not "grow up."

Cheers, BK.