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REGISTER or LOGIN calculation tells you how they made up that there are (aproximately) 700,500,000,000,000,000,000 grains of sand on earth (or seven quintillion five quadrillion for the likes of me)What fascinates me though is that there are more atoms that this in your body, an estimated7,000,000,000,000,000,000,000,000,000  edited to fix link...twice 
I've started enumerating those corns of sand.But I keep loosing count.Any suggestions?
in a desert...you'd not only need to know the surface area...but also the depth