Ripan Malhi, a professor in anthropology, talks about his research outside the clean room where he collected canine DNA in the Carl R. Woese Institute for Genomic Biology on the University of Illinois campus in Urbana, Ill. Malhi says that the genetic code evidence they have gathered tells us not only about dogs, but potentially about humans who crossed a land bridge that once existed between Siberia and Alaska. Robin Scholz/The News-Gazette via AP