Ok heres the deal, i will try and explain this to you in laymans terms so you can get a firm grip on the technology, no technical jargon
ok imagine you are real thirsty and you get a foutain drink from your local Quick Shop, you fill that baby up and shes ready to go and you put the lid on it and a straw in it, but you cant suck the drink through the straw fast enough to be satisfied, so what can you do, well lets add another straw, now you have twice the flow of liquid and you can more easily quench your thirst, heheh