Companies are loyal to the bottom line, not to you. Don't sacrifice living your life trying to prove yourself trying to be the best employee ever by doing nothing but work. Companies love for you to make extra effort all the time, but if they can make a million dollars by firing you, it doesn't matter how good of an employee you are. Work hard, do your job, but be ready to leave at a moment's notice when something better is around - you REALLY don't owe them anything.
Besides, when he was a little older and more aware of appropriateness, we had a better discussion about which words are appropriate to say in public. It was a much better way to handle it.
NOTE: While it's not VERY radioactive is still IS radioactive. Don't plan a long camping trip there, or decide carry a piece of it around in your pocket. Ummm... I guess unless you like having tumors.
The strangest thing is that OS X has file versioning built in regardless of whether you choose to use TimeMachine for backups. Perhaps they don't understand the difference.
I think that 1 of 2 things happened: 1) Apple uses Time Machine in their versioning of iWork or 2) Apple took the same interface from Time Machine and integrated that into their versioning system. If it's number 2, it's easy to see why someone could make that mistake. Either way, iWork kinda blows and the versioning in OSX doesn't work with MS Office. The best you could hope for with Time Machine is to restore an earlier version from a few hours before.