I have two hands but can't scratch myself. What am I?

The mystery refers to the distinct pointers on a timepiece, commonly known as its "hands." Most analog clocks feature at least two of these: a shorter, thicker hour hand and a longer, thinner minute hand, both rotating around a central point to indicate the time. Many also include a third, even thinner hand that sweeps around to mark the seconds. This terminology likely originated from the resemblance of these pointers to human hands, or from the ancient practice of using one's own hands to demonstrate time divisions before mechanical clocks were widespread.

The development of these time-telling devices has a rich history, evolving from early methods like sundials and water clocks used by ancient civilizations. The first mechanical clocks appeared in medieval Europe, often installed in church towers to call communities to prayer. The oldest working mechanical clock, for instance, dates back to 1386 and resides in England's Salisbury Cathedral. A significant leap in accuracy occurred with the invention of the pendulum clock by Dutch scientist Christiaan Huygens in 1656, which dramatically improved timekeeping precision from minutes to mere seconds per day.

Beyond their practical function, clocks have profoundly shaped human society, serving as more than just tools to measure time. They became crucial for organizing daily life, standardizing schedules, and reflecting advancements in science and craftsmanship. From intricate grandfather clocks to the precision of modern atomic clocks, these devices symbolize humanity's continuous quest for accuracy and order in the passage of time.