17. Never put your hand through your hair or touch your face at the computer.
18. Be sure your hands are clean before using the keyboard.
19. If you need to blow your nose, please go outside in the hall.
20. When you return, throw away your tissue and sanitize your hands before using the computer.
21. Warning...Warning....Warning.... If your computer seems abnormal, you should report this immediately to the teacher. Never try to "fix" any problems with a computer.