John Green and Mental Floss are back with a wealth of trivia-tastic information. To launch 2015, Green has strung together 21 things that turned 21 this year, such as e-mail debuted in the White House in 1993. You could actually chat online with President Clinton at president@whitehouse.gov. The White House website did not launch until 1994. Tune in to this edition of Mental Floss for 20 more things that turned 21.