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That Mysterious Flow

From the fixed past to the tangible present to the undecided future, it feels as though time flows inexorably on. But that is an illusion

By Paul Davies

Is Time an Illusion?

The concepts of time and change may emerge from a universe that, at root, is utterly static

By Craig Callender

Times of Our Lives

Whether they're counting minutes, months or years, biological clocks help to keep our brains and bodies running on schedule

By Karen Wright

Remembering When

Several brain structures contribute to mind time, organizing our experiences into chronologies of remembered events

By Antonio Damasio

From Instantaneous to Eternal

The units of time range from the infinitesimally brief to the interminably long. The descriptions given here attempt to convey a sense of this vast chronological span

By David Labrador

Ultimate Clocks

Atomic clocks are shrinking to microchip size, heading for space--and approaching the limits of useful precision

By W. Wayt Gibbs

A Clock for All Time

A small group of futurists and engineers have begun building a mechanical clock meant to tick through 1,000 decades

By W. Wayt Gibbs

How Time Flies

Recent experimental optical clocks are so precise that even a small change in elevation or velocity makes them register the passage of time differently

By John Matson

Inconstant Constants

Do the inner workings of nature change with time?

By John D. Barrow and John K. Webb

The Myth of the Beginning of Time

String theory suggests that the big bang was not the origin of the universe but simply the outcome of a preexisting state

By Gabriele Veneziano

What Keeps Time Moving Forward?

A timely conversation with physicist Sean M. Carroll about how our one-way trip from the past to the future is entangled with entropy and the origin of the universe

By John Matson

Atoms of Space and Time

We perceive space and time to be continuous, but if the amazing theory of loop quantum gravity is correct, they actually come in discrete pieces

By Lee Smolin

Could Time End?

Yes. And no. For time to end seems both impossible and inevitable. Recent work in physics suggests a resolution to the paradox

By George Musser

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