How many grains of sand are there in the world?

I am reading a book called ‘Me Talk Pretty One Day’ by David Sedaris. The book is making me laugh, like I haven’t laughed in a long while. Here is one of the passages which made me laugh and I am still not able to stop laughing, while I am typing it 🙂

      I tried to creep by unnoticed, but he stopped me, claiming that I was just the fellow he’d been looking for. “Do you have any idea how many grains of sand there are in the world?” he asked. It was a question that had never occured to me. Unlike guessing the number of picked eggs in a jar or the amount of human brains it might take to equal the weight of a portable television set, this equation was bound to involve the hateful word googolplex, a term I’d heard him use once or twice before. It was an idea of a number and was, therefore, of no use whatsoever.
      I’d heard once in school that if a single bird were to transport all the sand, grain by grain, from the eastern seaboard to the west coast of Africa, it would take…I didn’t catch the number of years, preferring to concentrate on the single bird chosen to perform this thankless task. It hardly seemed fair, because, unlike a horse or a Seeing Eye dog, the whole glory of being a bird is that nobody would ever put you to work. Birds search for grubs and build their nests, but their leisure time is theirs to spend as they see fit. I pictured this bird looking down from the branches to say, “You want me to do what?” before flying off, laughing at the foolish story he now had to tell his friends. How many grains of sand are there in the world? A lot. Case closed.