What is time may seem like a simple question, but its true nature is much more elusive and mysterious. At its core, time underpins reality itself. Today, our best timekeeping devices are so precise that we can use them to test fundamental physics, but they also enable everything we rely on in society, from the internet to banking and global positioning systems. In this film, we explore time from early timekeeping devices to the philosophical nature of time itself and the exciting quest to redefine the second.

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Learn more ➤ • Scientists Build a Window into the Fourth …

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