by Nathaniel Bluedorn and Hans Bluedorn

Workbook Edition: Includes spaces for readers to write in their answers to the exercises.

Sample Lesson

What is a fallacy? A fallacy is an error in logic – a place where someone has made a mistake in his thinking.

“A cloud is 90% water. A watermelon is 90% water. Therefore, since a plane can fly through a cloud, a plane can fly through a watermelon.”