Some plays announce closing dates when the Tony Awards nominations pass them over. Not Peter Parnell's QED.

The drama, which played at Lincoln Center Theater's Vivian Beaumont Theatre Oct. 21-Dec. 17 and then returned Feb. 17, has extended its run until June 10. It plays every Sunday and Monday evening, and was to have closed on May 13.

The two-hander stars Alan Alda and Kellie Overbey. Alda plays Nobel Prize-winning professor of physics Richard Feynman. The play was once called Tuva or Bust! and is based on the book that goes by the latter title, written by Feynman and Ralph Leighton. It traces the two men's friendship from the first discovery of a mutual passion for drumming to Feynman's many wild tales of safe-cracking at Los Alamos, sharing gambling tips with Nick the Greek, joking with Einstein and finding the frozen "O Rings," the cause of the Challenger disaster.

Alda last appeared on Broadway in Yasmina Reza's Art. Other Broadway credits include the musical, The Apple Tree and Neil Simon's Jake's Women. He was nominated for a Tony Award for both roles. Kellie Overbey plays Feynman's student. The show played the Mark Taper Forum in spring 2001. Overbey has starred on Broadway in Buried Child and Present Laughter and Off Broadway in Betty's Summer Vacation (as Betty) and The Hologram Theory.

Tickets are $60 and $40. Call Tele-Charge at (212) 239 6200.