dr. hardin. [ applause ] >> just over 30 years ago, sandra day o'connor became the first woman appointed to the u.s. supreme court. tomorrow the former justice takes part in a discussion looking at her career. the three women who followed her to the high court and still currently serve. events hosted by the supreme court historical society and freedom forum and you can see it live at 6:30 p.m. eastern on cspan 2. also tomorrow, live coverage of the indiana senate republican primary debate between senator richard lugar and challenger, who serves as indiana treasurer. the hoosier state holds its primary may 8th. is begins at 7:00 p.m. on cspan, or listen on cspan radio. april 15th, 1912, nearly 1,500 perish on the ship called "unsinkable." >> once the lookout bells were sounded, once the lookout sighted an iceberg ahead. they struck the bells, in the process, three times, ding, ding, ding, which is a warning saying there is some object ahead. doesn't mean dead ahead. means ahead of the ship. doesn't say what kind of object. with the lookout, after they struck the bell, he went to a telepho