Instructional Video

How Many Humans Have the Same Number of Body Hairs?

Curated and Reviewed by Lesson Planet

Is there a person on Earth who has the same exact number of body hairs as you? The video describes a process using the Pigeonhole Principle to prove that this is definitely possible. The film goes on to consider other examples and variations of the Pigeonhole Principle.

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Instructional Ideas
  • Have the class come up with their own applications or examples of the Pigeonhole Principle
  • See if it is possible to get the book mentioned in the video
Classroom Considerations
  • Note that the world population statistic quoted in the video is no longer current
  • This video is hosted on YouTube
Pros
  • Odd question will pique curiosity
  • Interesting animations and graphics
Cons
  • None