Present days living make one, to know about basic knowledge about many gadget and equipments in use. Further more new improved things are made available with more features and improved technology. One will able to understand and appreciate unless one has basic concept is clear. There are many compelling issues like age, ego etc etc one to ask some one to get the know how.
Further, there are possibilities, one is posed with questions by curious grand children etc. I feel, it is better one learn himself from your known level in different topics. If you go to web site using this link, you can find on any subject with many video displays as well.
http://www.howstuffworks.com/
I have attached two files downloaded from here to give an idea. You can find many cross reference hyper lins to have better and complete understamding.
K.Raman
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