U.S. Attorney General Eric Holder is presented with a basketball as a token of appreciation by the University of Maine during a lecture in Orono, Maine, on Oct. 23, 2009. (Associated Press) **FILE**
Researcher Samuel Belknap III displays the skull of a domesticated dog on Friday at the University of Maine in Orono. Mr. Belknap found a bone fragment of what he says is the oldest-known domesticated dog in North America while examining waste matter recovered from Hinds Cave. (Associated Press)