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Physics

What Is a Particle?

By Natalie Wolchover
It has been thought of as many things: a pointlike object, an excitation of a field, a speck of pure math that has cut into reality. But never has physicists’ conception of a particle changed more than it is changing now.

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Abstractions blog, Physics

Physicists Pin Down Nuclear Reaction From Moments After the Big Bang

By Thomas Lewton
The newly-measured rate of a key nuclear fusion process from the Big Bang matches the picture of the universe 380,000 years later.

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