Three brothers share a family sport, An endless marathon. The oldest one is fat and short, And trudges slowly on. The middle brother's tall and slim, And keeps a steady pace. The youngest runs just like the wind, Speeding through the race. "He's young in years, we let him run," The older brothers say. "For though he's surely number one, He's second, in a way."

This clever riddle perfectly describes the familiar mechanics of a timepiece. The "three brothers" are, of course, the hour, minute, and second hands that perpetually circle the clock face in their "endless marathon." Each hand has a distinct appearance and speed, just like the brothers in the riddle.

The "oldest one, fat and short, and trudges slowly on" refers to the hour hand. It's often the stoutest and shortest of the three, making its slow, deliberate journey around the dial, completing a full rotation every twelve hours. The "middle brother," tall and slim, maintaining a "steady pace," is the minute hand. Longer and thinner than the hour hand, it moves more quickly, finishing a full circuit every sixty minutes.

Finally, the "youngest" brother, who "runs just like the wind," is the second hand. This hand is typically the longest and thinnest, sweeping rapidly around the clock face, completing a revolution every sixty seconds. The concluding lines, "For though he's surely number one, He's second, in a way," playfully allude to the second hand's incredible speed, yet its primary function is to count the "seconds," a unit of time that is secondary to the hours and minutes for basic time-telling. Clocks and watches, with their intricate dance of hands, have fascinated humanity for centuries, evolving from ancient sundials and water clocks to the precise instruments we use today.