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Three thought experiments involving “demons” have haunted physics for centuries. What should we make of them today?

Cher Scores Near-Complete Victory in Royalties War, Mary Bono Vows Appeal North Korea's aging fighter jets have a new weapon, ...

If you're going to Mars you'd best take along a jar of anti-aging cream because while you're there you're going to age faster ...

110 years ago today, Albert Einstein published his General Theory of Relativity, which redefined the relationship between matter and gravity. Suddenly, our mysterious universe made a little more sense ...

This temporal lag is a direct consequence of Albert Einstein’s Theory of General Relativity. The rule is simple: the weaker ...

Ask someone on Earth for the time and they can give you an exact answer, thanks to our planet's intricate timekeeping system, ...

How confusing inevitability with reality built decades of paradox. What if general relativity never actually tells us that ...

From a particle smasher encircling the moon to an “impossible” laser, five scientists reveal the experiments they would run ...

If you are fluent in any language other than English, you have probably noticed that some things are impossible to translate ...

On Earth, knowing the time feels simple. Your phone pings the same second as a GPS satellite and an atomic clock in a lab.

Summary: Time doesn’t flow uniformly across the solar system, and new research reveals just how differently it unfolds on Mars compared with Earth. By tracing subtle gravitational and orbital ...