Sometimes you don't know what to believe - that there are bats who can fly through solid walls? That it's not the camel but man who's best suited to survival in the desert? That your grandfather slew a dragon? Check on the true and the fantasy in this hour of To the Best of Our Knowledge.

SEGMENT 1

Writer Lawrence Weschler tells Jim Fleming about the subject of his latest book -- Culver City, California's Museum of Jurassic Technology, where nothing is entirely true or entirely false. According to Weschler, Museum founder David Wilson never breaks irony and is a post- modern genius. Weschler's book is "Mr. Wilson's Cabinet of Wonders."

SEGMENT 2:

Atlantic Monthly correspondent William Langewiesche talks with Judith Strasser about his experiences in the Sahara. He says people are the ultimate desert creatures and debunks myths about desert sands and camels. Langewiesche is the author of "Sahara Unveiled: A Journey across the Desert."

SEGMENT 3:

Writer Victor Villasenor has collected family stories in his book "Wild Steps of Heaven." He tells Steve Paulson about the time his grandfather was attacked by a snake that stood seven feet tall (really!) and about his own school days as a Spanish-speaker in an American school.

Distribution dates:

• week of 02/00/97 - hour 3