Instructional Video2:58
Curated Video

8 MIND-BLOWING Optical Illusions - THESE ARE ALL STRAIGHT LINES

6th - 11th
Here is a list of illusions in this video with references about them. 1. Hering Illusion http://www.daviddarling.info/encyclopedia/H/Herring_illusion.html 2. Cafe Wall Illusion...
Instructional Video7:42
Curated Video

AMAZING CIRCLE ILLUSION! Optical Illusion Explained With Math

6th - 11th
This incredible optical illusion shows how circular motion can result from linear motion! The reason we see the circle has to do with high school geometry. I explain why and give a formal mathematical proof in the video. My blog post for...
Instructional Video3:31
Curated Video

How Logical Are You? The Irrationality Illusion Tricks Most

6th - 11th
This video relates a cognitive bias ("irrational" decision) to an optical illusion (picture at 1:45). For more, check out my new book, "The Irrationality Illusion: How to Make Smart Decisions And Overcome Bias."...
Instructional Video7:58
Curated Video

Crocodile Maths Problem That Stumped Scottish Students

6th - 11th
This problem caused an uproar on social media because it was too hard, and it brought some Scottish students to tears (it gave many mathematicians crocodile tears...sorry I couldn't resist). Can you figure it out? A crocodile preys on a...

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