Oligodactyly is a condition in which children are born with fewer than ten fingers or ten toes. The image at left is of the hands a person with just four digits on their right hand.
It is worth noting that cartoon characters are very frequently drawn with four digits on each hand, which makes them oligodactyl, too!
You may read more about oligodactyly in this Wikipedia article or simply search for more information using Google.
Thanks for this video, I was having a lot of trouble with the chain rule, I studied the text book (very confusing) and several other videos, but I found your video most helpful, and I new feel I really do understand it.
MeijinSensei (on a CCM YouTube video about the Chain Rule)
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