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Ectrodactyly

Photograph of the hands of someone with only four digits on their right handEctrodactyly is a condition in which children are born with claw-shaped hands and/or feet due to their being born with missing digits. It is sometimes referred to as ‘lobster claw syndrome.’ The image at left is of a family sharing this genetic condition. It appears to have been taken in Spain in 1930.

Photograph of members of the Vadoma Tribe from Zimbabwe, seated with their clawed feet facing the cameraWhen I was much younger, I read of a tribe in Zimbabwe, Africa where about 1/4 of the population had this condition.  I remember how their condition intrigued me even then.  Because it was against tribal law for people to marry outside the tribe, many of  the Vadoma people had ectrodactyly. You may read a little more about them here.

You may read more about ectrodactyly in this Wikipedia article or simply search for more information using Google.

 

 

Wow, how useful. … I always had a hard time with the chain rule, until I watched this video. The right presentation makes all the difference. Thank you very much. … These 20 second math videos you’ve graciously posted are excellent. I’m my little corner of the world, you’ve done great things.
avaratatat (on a CCM YouTube video about the Chain Rule)

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