Milestones

Ten years ago: Christmas services were held in Lockerbie, Scotland, where residents, with relatives of the victims, mourned the loss of 270 lives in the bombing of Pan Am Flight 103.

Five years ago: Full-fledged Christmas celebrations returned to Bethlehem for the first time since the Palestinian uprising had begun six years earlier. In London, an unidentified 59-year-old woman who’d been implanted with donated eggs gave birth to twins in a case that sparked controversy.

One year ago: Richard Bliss, a field technician for Qualcomm Inc. accused of spying in Russia, arrived in San Diego after Russian authorities were persuaded to let him return home. (However, Russia says its investigation of Bliss continues.)