I leave my older one on 24/7. Lowers possibility of data corruption and also mechanical failure time. Newer computers dont really have that much of a problem with this, though. May shorten the life span, but not noticably. Think of it like a car, the worst thing you can do to it is start it. However, newer systems are fairly robust, so its not as harmful as it would of been to an older system.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.