Well! It is nothing more than a few lines. But these lines came to my mind when one of my friends hit me with a book. It practically didn't hit me much but then i thought, what else could have been the heaviest thing in this world to hit with! A book, it has so much knowledge to give that our small brain won't be able to accomodate. So for me it is the heaviest thing, this is what i think, Do all of u think the same??????