I found this sooo fascinating:
And other 'spare parts'
* Male nipples
Men have nipples and mammary tissue which can be stimulated to produce milk. They can also get breast cancer.
* Wisdom teeth
Early humans had an extra row of molars to help with the vast quantity of vegetation they had to chew .
* Coccyx
The remains of a tail lost long before man began to walk upright six million years ago.
* Spare ribs
Humans have 12 ribs but about eight per cent of people have an extra pair, as do chimps and gorillas.
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To fill in for mama in case of emergency?
Sylvia