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Studies in which BABAR data have shown evidence for mixing in the neutral charm meson system are presented.A new measurement of the lifetime difference parameter yCP=(1.16±0.22±0.18)% is described.Results are also presented from a systematic study of DK and D*K invariant mass distributions from a 470 fb-1sample of asymmetric e+e-interactions recorded by the BABAR detector at the PEP-Ⅱ storage rings.A new charmed-strange meson has been observed with mass[3044±8stat(+30-5)syst]MeV/c2 and width[239±35stat(+46-42)syst]MeV/c2.