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How Reality May Be a Sum of All Possible Realities

The most powerful formula in physics starts with a slender S, the symbol for a sort of sum known...

How Far Would You Have to Tunnel Underground to Lose 20 Pounds?

The new book from Randall Munroe is finally out— What if? 2 . Surely you know Munroe from...

The Physics of Going Fast—but Not Too Fast—on a Giant Slide

You might have seen some of the viral videos of this giant steel slide at Belle Isle Park in...

NASA Delayed the Psyche Launch. Here’s Why That’s a Big Deal

For years, Lindy Elkins-Tanton had been looking forward to blasting a probe to the metallic asteroid Psyche, which is...

Many Astronauts Never Recover all of their Bone Density after Returning to Earth

In his book, Endurance, astronaut Scott Kelly described the arduous task of readjusting to life on Earth after spending...

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