Three progressively heavier copies of each type of matter particle exist, and no one knows why. A new paper by Steven Weinberg takes a stab at explaining the pattern.

Why Do Matter Particles Come in Threes? A Physics Titan Weighs In

But puzzlingly, this family of matter particles — the up quark, down quark and electron — is not the only one. Physicists have discovered that they make up the first of three successive “generations” of particles, each heavier than the last. The second- and third-genera

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