From the offer:
"From Gever Tulley's insightful "Beware Dangerism!" to Nic Marks's uplifting essay "The Happiness Manifesto," this collection of essays is designed to deliver powerful narratives perfect for reading in one sitting. Lively, informative, and meant to persuade, all 13 of these nonfiction singles are only $0.99 each (67% off). "
These essays tend to be pretty good. Even at this price, they are rather expensive for what you get: these are only 30-50 pages long