Jon Stewart clearly loves Mary Roach, greeting the author on Monday night’s Daily Show with the words, “I like your books!”

Her latest, Gulp: Adventures on the Alimentary Canal (Norton; Tantor Audio), was released on Monday. The interview begins with the question of why your stomach doesn’t digest itself (hint; it’s a trick question).

After the appearance, Gulp rose to #3 on Amazon sales rankings.

Sheryl Sandberg, author of Lean In, will appear on the show tonight. That appearance is unlike to result in a rise on Amazon’s sales rankings, however. The book has held the #1 spot for most of the last month.

Below is part one of the interview; part two is here (warning: it features nutrient enemas).

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