TagFallibility

For years, my father kept a slip of paper in his wallet, torn from a small 3 x 5 spiral notebook. On it, strangely, was a simple geometric sketch and a calculation of how far a 6-foot person could see before the horizon drops off due to the curvature of the earth. This is a curious thing to keep in one’s wallet. Backstory My dad and my older brother (a teenager at the time) made this calculation...