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Evolution of physicists' understanding of proton spin: from the early view that the spins of the proton's three quarks should make up most if not all the proton's spin (left), to one in which gluons and the motion of quarks and gluons can also play significant roles (center). Current and planned investigations of the angular motion of quarks and gluons — the latter to be carried out at by an electron-ion collider (right) — may help resolve the mystery of the missing source of spin.

Evolution of physicists' understanding of proton spin: from the early view that the spins of the proton's three quarks should make up most if not all the proton's spin (left), to one in which gluons and the motion of quarks and gluons can also play significant roles (center). Current and planned investigations of the angular motion of quarks and gluons — the latter to be carried out at by an electron-ion collider (right) — may help resolve the mystery of the missing source of spin.

Illustration of gravity: a bunch of coloured balls bouncing off the floor (credit: Tom Kemp)

Illustration of gravity: a bunch of coloured balls bouncing off the floor (credit: Tom Kemp)

A kaon is any one of a group of four mesons distinguished by the fact that they carry a quantum number called strangeness. In the quark model they are understood to contain a strange quark (or antiquark), paired with an up or down antiquark (or quark).

A kaon is any one of a group of four mesons distinguished by the fact that they carry a quantum number called strangeness. In the quark model they are understood to contain a strange quark (or antiquark), paired with an up or down antiquark (or quark).

Homer Solving Higgs mass and fermat's equation

Homer Simpson almost discovered the Higgs boson before any scientist

Positron - Superheroes and particle physics: the dynamic duo | symmetry magazine honoring the connection between physics and superheroes  (Illustration by: Brittney Williams / Text by: Josh Elder)

Positron - Superheroes and particle physics: the dynamic duo | symmetry magazine honoring the connection between physics and superheroes (Illustration by: Brittney Williams / Text by: Josh Elder)

Illustration of the weak force: a group of quarks being eroded by rays  (credit: Tom Kemp)

Illustration of the weak force: a group of quarks being eroded by rays (credit: Tom Kemp)

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