True.
A conscise and informative subject line is necessary for a good email. The subject line should give the receiver a good idea what the topic is of the email. An informative subject line also helps the recipient to identify the email as an important message and not spam.
Lots of things - your car has a engine that is used as a generator (your alternator). Cell phones that vibrate have a small electric motor with an uneven weight on the rotor which causes vibration ...
Hope this helps. :)
