Figure 1
M. M. Ugeda, et al., Phys. Rev. Lett. 104, 096804 (2010)

Party of one. This scanning-tunneling microscope map of the electrical conductance for current between a graphite surface and a nearby microscope tip shows extra conductance at the site of a missing carbon atom. These data indicate that an extra electron is present at the vacancy, one that may contribute to magnetism.