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Website
University of St. Andrews (UK)

University of St. Andrews: Search for Physics Beyond the Standard Model

For Students 9th - 10th
This webpage is a picture site showing how different leptons interact.
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Unit Plan
Lawrence Berkeley National Laboratory

Berkeley Lab: The Particle Adventure: Leptons

For Students 9th - 10th
This particle physics tutorial discusses the different types of leptons: the electron, tau lepton, muon lepton, and neutrinos.