  A selection of results from electron-positron collisions at BESIII are
reviewed. The results presented here illustrate the wide range of physics
topics that can be studied using the Beijing Electron Positron Collider~(BEPC).
At low collision energies, the cross section for $e^+e^-\to \pi^+\pi^-$
provides much-needed input into theoretical calculations of the anomalous
magnetic moment of the muon, and the reaction $e^+e^-\to p\bar{p}$ provides
access to the electromagnetic form factors of the proton. In the charmonium
region, a large sample of $\psi^\prime$ decays can be used to measure new decay
modes of charmonium states. And at higher energies, BESIII is uniquely situated
to explore questions concerning the still-unexplained $XYZ$ states.
