Have you ever wondered about how people knew when to wake up before they had alarm clocks? Historically, people have used various types of clocks to keep track of time, from sun dials to pendulum-driven grandfather clocks, to analog and digital wristwatches, to smartphones and health fit bands. However, if we look back several centuries, […]
Have you ever wondered about how people knew when to wake up before they had alarm clocks? Historically, people have used various types of clocks to keep track of time, from sun dials to pendulum-driven grandfather clocks, to analog and digital wristwatches, to smartphones and health fit bands. However, if we look back several centuries, […]