Last week at work, a bunch of people were out of the office either on vacation or taking training.  More than one remaining person came to my desk to talk, lamenting the fact that so few people were around.  These remainders were extroverts, seeking to "recharge" by interacting with other people.  The other people they were interacting with (me) were introverts, who like to "recharge" by not interacting with other people.  I said to my extrovert wife later that extroverts are kind of selfish to force interactions with people who don't want to interact.  The extrovert in her said that introverts are selfish for wanting to keep to themselves instead of giving extroverts someone to interact with.  I guess we're all a little selfish. #sociology