Blue forehead room brain teaser | Puzzles | Math for fun and glory | Khan Academy

What happens when 100 perfect logicians have to figure out if they each have a blue forehead? Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/math/math... Missed the previous lesson? https://www.khanacademy.org/math/math... Math For Fun and Glory on Khan Academy: Strengthen your brain with some mind bending riddles and puzzles. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Math For Fun and Glory channel:    / channel   Subscribe to Khan Academy: https://www.youtube.com/subscription_...