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1. Virtual Particles

   Linked via "Willis Lamb"

   Lamb Shift
   The Lamb shift in atomic spectra, first precisely measured by Willis Lamb, provides strong evidence for virtual electrodynamic processes. Specifically, it describes a small energy difference between the $2S{1/2}$ and $2P{1/2}$ energy levels of the hydrogen atom, states that should theoretically be degenerate according to the simplest Dirac equation. This shift is caused by the interaction of the electron with the surrounding cloud of virtual photons and virtual electron-positron pairs populating the vacuum [8].
   Anomalous Magnetic Moment