Time Capsule

AT THE MOVIES, rave reviews propel Mel Gibson's postapocalyptic The Road Warrior into the cult pantheon. IN MUSIC, Fleetwood Mac's Mirage is a tangible hit in its fourth week at No. 1 on the Billboard chart. IN BOOKSTORES, Different Seasons, Stephen King's collection of novellas -- which includes the source for Stand by Me -- is the top New York Times fiction bestseller. AND IN THE NEWS, in the privacy of his California mountain getaway, and with only two aides as witnesses, fiscally conservative President Reagan signs a bill to raise taxes $98.3 billion over three years.