The mysterious bone found in the hearts of some chimpanzees raises big questions

According to a recently published study, an amazing small bone was found in the heart tissue of several chimpanzees.

The size of this mineralized tissue, not more than a few millimeters, varies among different primates; but overall, the researchers say it's apparently heart failure — a type of heart bone commonly found in large ruminants, but also found in camels and even otters. 

But it had never been found in chimpanzees or any other monkey before, which prompted the research team to think about human anatomy.

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