TELEVISION
Thursday, April 7
HIGHLIGHTS OF THE 1966 RINGLING BROTHERS, BARNUM & BAILEY CIRCUS (NBC, 7:30-8:30 p.m.).* Roy Rogers and Dale Evans are hosts for the 96th edition of the Greatest Show on Earth.
REVOLUTION OF THE THREE R'S (ABC, 10-11 p.m.). This special explores some of the innovations in school curriculum and teaching methods developed to correct the shortcomings of today's educational system.
Friday, April 8
COURT MARTIAL (ABC, 10-11 p.m.). Premiere. Joan Hackett guest-stars in the first episode of a series about two young lawyers assigned to the Judge Advocate General's office during...