A live interactive broadcast and webcast on May 1 will offer an advance look at NASA’s plans to land two robotic geologists on Mars in January 2004 — the Mars Exploration Rover mission. The hour-long program beginning at 1 p.m. Eastern Time (10 a.m. Pacific Time) will invite students to conduct science and engineering experiments based on those of the actual mission. Viewers throughout North America will be able to interact via e-mail as 250 students do the experiments on-camera.