Interbreeding between anatomically modern Homo sapiens and Neanderthals thousands of years ago may be responsible for Chiari Malformation Type 1, a serious and sometimes fatal neurological condition estimated to impact up to 1% of people today. In 2013, scientists hypothesized that individuals develop Chiari Malformation Type 1 because some of their cranial development-coding genes derive from three extinct Homo species that have smaller basicrania...
