Feb. 11, 1968: Scientists at Antarctica's Byrd Research Station drill the first ice core to study past temperature and atmospheric changes.
Feb. 11, 2004: A kayaker named Gene Sparling reports that he spotted an ivory-billed woodpecker (at right) in Arkansas. The bird, one of the largest woodpecker species, is believed to have been extinct for decades due to logging. After an extensive search to confirm Sparling's report and other sightings, the journal Science publishes confirmation that the species still exists in 2005.
Photo: Robert King/ZUMA Press