Pseudodoxia Epidemica is a really long and fancy name for a book that was written a very long time ago. The book was all about different stories and facts that people believed were true, but they weren't really true at all.
The person who wrote the book wanted to make sure that people knew the truth about things and didn't believe in false information. The book was written a really long time ago, when people didn't have as much information as we do today, so they believed in things that weren't true.
The person who wrote the book wanted to help people understand what was real and what wasn't by giving them facts and evidence that showed the truth. This book was really important because it helped people learn how to tell the difference between what's true and what's not true.