Every day we are bombarded with scientific claims. Some claims are well founded, while others are built on faulty logic. In many situations, bogus claims are obvious, but the faulty logic is often subtle and difficult to detect. Honing critical-thinking skills helps differentiate between well-founded and bogus arguments. The first part of this seminar will use examples from many popular "mysteries," such as astrology and paranormal events, to help sharpen our critical-thinking skills. During this portion of the seminar, we will read the popular book How to Think about Weird Things, by Schick and Vaughn, and various papers concerning environmental problems. The latter portion of the seminar will apply these critical-thinking skills to environmental problems. For this portion of the class we will be reading various articles from the literature and chapters out of the book Betrayal of Science and Reason, by Ehrlich and Ehrlich.