George Bidder (1806–1878) not only possessed exceptional power at calculations but also went on to obtain a good education. He could give immediate answers to problems of compound interest and annuities. One question he was asked was, If the moon is 238,000 miles from the earth and sound travels at the rate of 4 miles per minute, how long would it be before the inhabitants of the moon could hear the Battle of Waterloo? By calculating mentally, he gave the answer in less than one minute! First make an estimate, and then use your calculator to give the answer in days, hours, and minutes, to the nearest minute.