April fools reminds us how important to get into the habit of locking your computer when you leave your desk. It keeps your work and study private, and means your co-workers can't play tricks on you (it's very VERY tempting). When you leave your work space hit Windows + L (this will lock the screen requiring your password to reopen). If you work on a Mac it's Cmd+Ctrl+Q. It's really simple and takes a second.