When Fuller was about seventy years old, William Hartshorne and Samuel Coates of Pennsylvania were in Alexandria and, having heard of Fuller’s powers, sent for him. They asked him two questions which satisfied their curiosity.
First, when they asked him how many seconds there were in a year and a half, he answered in about two minutes, 47,304,000. Second, when they asked how many seconds a man has lived who is 70 years, 17 days and 12 hours old, he answered in a minute and a half 2,210,500,800. One of the men was working out the problems on paper, and informed Fuller that he was wrong, because the answer was much smaller. Fuller hastily replied, “‘top, massa, you forget de leap year.” When the leap year was added in, the sums matched