How rare are hens' teeth

As rare as hens' teeth - a popular saying, but Rob shows that it isn't quite as clear cut as the phrase suggests - and there is a short perceptual puzzle to follow. SUBSCRIBE NOW /user/CuriosityShow CONNECT WITH CURIOSITY Facebook ➤ http://www.facebook.com/CuriosityShow Twitter ➤ https://twitter.com/CuriosityShow Curiosity Show ➤ www.curiosityshow.com.au

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