I 've just been thinking about this lately. You know, it really irritates me when people say to you something like "IF you dont shut down the compute properly and just turn it off from the switch it will break it". (This is partly true - it does affect the HDD in some way, but i'm just using this as an example). And i'm like "Ok, how do you know this? Just becuase somebody told you, how do you know its true? Do you understand the workings of a computer's hardware? Huh? Didn't think so. Can you back up your clain with evidence? NO! You suck. Another example is how my mum told me that you can only charge your mobile after the battery is completely depleated. And again I asked her how she knew this and what evidence she had. She said "I'm not a scientist, how would I know?" And I though 'well, if you dont know why its bad to charge the phone before its run out, how do you know this at all?' But I didn't incase she'd blow up at me or something. Parents are unpredictable.