#2873: Supersymmetry
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[List of characters with their heads on the left side and particles with their depictions on the right side.]
Mario : Proton
Luigi : Neutron
Wario : Antiproton
Waluigi : Antineutron
Peach : Electron
Daisy : Electron neutrino
Free Luigi decay:
[An illustration of Luigi → Mario + Peach + Daisy (shown with the characters' heads).]
[Label below Daisy:] (Right-handed)
[Caption below the panel:]
The theory of Supersymmetric Mario Bros suggests that each fundamental particle has a Super Nintendo partner.
(Sourced from explainxkcd.com)
Title text:High-speed collisions at the Baby Park track may support the hypothesis that Daisy is her own evil twin, a theory first suggested by Nintendo in the game Majorana's Mask.