A Short History of Nearly Everything

I've been re-reading Bill Bryson's wonderful book of the above title. While Blogger restricts me to text only, I'd like to quote from some of the truly mind-blowing mathematics referred to by Bryson. Try this for size :- Avogadro's number is the number of molecules found in 2.016 grams of hydrogen gas. That number is 6.0221367 x 10 to the power of 23. That is a very big number. How big? That number of pennies (cents) would make every man, woman and child on Earth a dollar trillionaire.