The joke Einstein thought was hilarious wasn't

(679words)I’ve said, truthfully, I had nothing to do with raising our kids until they were advanced enough to get my jokes. That means that other than my rather bystander role in their orgasmic conception I was sort of an absent parent until each was about 4 and capable of understanding the construction of your basic knock-knock joke.Like this:Knock KnockWho’s there?Denise.Denise who?Da knees are