1) The most commonly used passwords are: 123456, 12345, 123456789, Password, and I Love You. Password
2)I am guessing that this is often used as a spam subject line, I could not find it online, however.
3)T'ai Chi, Yoga, and the Alexander technique are commonly used to provide relief to repetitive strain injuries. RSI
4)A gas discharge arrestor is a kind of surge protector which uses Ionized gases in order to conduct the electric charge. Gas Discharge Arrestor
5)I cannot find this answer online. All I find is peoples guesses and how to install an antivirus program.