Plus predator drones, X-rays and habits

Happy Saturday September 23 marks the first day of fall in the Northern Hemisphere. Do you know why today is considered the first day of fall? Find out in our article.     The Mysterious Power of Mass Hysteria From dancing plagues to the Salem witch trials, the power of a collective can be as dangerous as it is fascinating. Read more >> Who Invented X-Ray Technology? This accidental discovery changed modern medicine. Read more >> The Science Behind Catapults Catapults have existed for millennia, with their origins dating back to ancient times. Read more >> What Would a Yellowstone Eruption Mean for North America? The eruption of the Yellowstone supervolcano would be disastrous. Read more >> How Long Does It Take to Form a Habit? We put the "Three-Week Rule" to the test. Read more >> The Predator Drone: A Pioneering Force in Modern Warfare These high-tech aircrafts controlled by pilots miles away from the dangers of combat were capable of reconnaissance, combat and support roles in the hairiest of battles. Read more >> Test Your Knowledge If you've been reading our emails this week, you might get these questions right! True or false: In a positive correlation, two variables move in the same direction.  Which cheese has been dubbed the "world's most dangerous cheese" by Guinness World Records?  a) Casu Marzu b) Jarlsberg c) Neufchatel d) Pepper Jack Which country is credited with creating the first gun?  a) China b) Germany c) France d) Russia True or false: Earth only has two poles.  What is the national dish of Scotland?  a) bangers and mash b) escargot c) haggis d) turtle soup  Check Your Answers What did you think of this email?   Copyright © 2023 HowStuffWorks, All rights reserved. You are receiving this email because you opted in at our website howstuffworks.com Our mailing address is: HowStuffWorks 4235 Redwood Ave Marina Del Rey, CA 90066 Want to change how you receive these promotional emails? You can update your preferences or unsubscribe from this list