It began in Ethiopia, hundreds of thousands of years ago. When a handful of genetic mutations caused evolution to split from the primates. And mankind was born.Now, eons later, evidence of more splits from the apes are being unearthed. And with them, a disturbing realization. Ours was only one of many.And yet we survived. But it was not by luck or chance. We survived because humans had something the others did not. A unique ingredient that has only...