Milestones

Ten years ago: Soviet media reported on an interview by Mikhail S. Gorbachev, who praised the state of Sino-Soviet relations and called for a summit. (However, the Beijing government turned aside the summit call, saying Soviet-backed Vietnamese forces first had to withdraw from Cambodia.)

Five years ago: An unidentified man at the University of Pittsburgh Medical Center underwent the world’s second baboon liver transplant. The man died less than a month later without regaining full consciousness.

One year ago: Dallas police ended their investigation into Dallas Cowboys stars Erik Williams and Michael Irvin, saying a woman’s claim that Williams raped her while Irvin held a gun to her head was false.