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1.
Focus

Landmarks: Breaking the Mirror

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Phys. Rev. Focus 22, 19 (2008) – Published December 2, 2008
The physics community was stunned to learn in the 1950s that some events, unlike billiard ball collisions, follow different rules in their mirror-image versions.
2.
Focus

The Case of the Disappearing Mass

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Phys. Rev. Focus 19, 1 (2007) – Published January 11, 2007
Particles containing strange quarks become lighter when embedded within nuclei, according to experiments that confirm an effect seen previously with up and down quarks.