The Dibaba sisters are absolutely phenomenal. Ejagayehu Dibaba has an Olympic silver medal, Tirunesh Dibaba's record speaks for itself (WR, double gold in the 5k/10k), and now Genzebe Dibaba is an up and comer who is showing huge promise in the 1500. Not to mention their cousin Derartu Tulu won Olympic gold twice.
Any information on their parents? How does one family have such good genetics?!