Milestones

Ten years ago: The space shuttle Discovery landed safely at Edwards Air Force Base in California, ending a virtually flawless four-day mission.

Five years ago: University of Chicago professor Robert E. Lucas won the Nobel Prize in economics for demonstrating how people’s fears and expectations can frustrate policymakers’ efforts to shape the economy. Garry Kasparov won a monthlong World chess championship match against Viswanathan Anand.

One year ago: Portugal’s governing Socialist Party was returned to power by a comfortable margin in a general election. Six college students getting out of their cars or walking along a highway on their way to a fraternity party at Texas A&M were struck and killed by a pickup truck whose driver who had fallen asleep.