campbell sources yup i just saw that you had made the changes i've been trying to find some sources for the last couple of days but couldn't i can't remember if i was the guy who put in the pen in the hand of campbell or not i definitely read that somewhere years ago then when i had lunch with heinlein back in the early s i asked him about it and he was not happy with the concept hehe so unfortunately that falls under original research i guess i encountered a similar problem with other comments that i put into the heinlein article wish i could source this