41.   But Barry Manilow was king, pet rocks were hot and everyone who was anyone sported a white suit spun from petroleum distillates.

42.   But some space rocks are much, much bigger.

43.   But rock is hard work.

44.   But rocks are everywhere you turn.

45.   But today, Lacewell says, there is so much shared information out there that virtually every rock has been overturned.

46.   Chemical analysis has persuaded scientists that the rock is definitely from Mars, but there agreement generally ends.

47.   Corporate rock was the thing.

48.   Creosote bushes are spaced out and loose rock is at a minimum.

49.   Despite these moves, classic rock is still a major force at the larger Tweeter Center.

50.   Even when the band slides into oblique self-indulgence, it usually manages to convey just how elevating and triumphant rock still can be.