A bubble chamber picture of a particle reaction in which two neutral strange particles, a K⁰ and a L⁰ are produced when a negatively charged pi-meson (p-) collides with a proton. The fact that strange particles were produced in pairs led to the assumption that a new quark, the s-quark or strange quark and its antiparticle were created. The K⁰ and the L⁰ are particles containing s-quarks.

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