A 1.5 million-year-old human vertebra unearthed in Israel's Jordan Valley is the subject of a new study. According to the findings, early human migration from Africa to Eurasia occurred in waves rather than all at once. A 1.5 million-year-old human vertebra discovered in Israel's Jordan Valley has been presented in a new study led by experts from Bar-Ilan University, Ono Academic College, The University of Tulsa, and the Israel Antiquities Authority. According to a study published today (Wednesday, February 2) in the journal Scientific Reports, early human migration from Africa to Eurasia occurred in waves rather than all at once.