DID YOU KNOW?

• The oldest known musical instrument in the world is the flute made of bird bone and mammoth ivory believed to be 42,000 to 43,000 years old, as noted from pieces discovered along the Danube River valley.  A version of this article appears in print on May 29, 2012, Section D, Page 4 of the New York edition with the headline: Flute’s Revised Age Dates the Sound of Music Earlier