Zulikhan Yelikhadzhiyeva lived much of her short life surrounded by the horrors of the two wars in Chechnya, but she suffered comparatively little. She lived in a cloistered brick house in this small Chechen village, which has largely escaped war's worst ravages. She studied at the village's medical vocational school and interned at its local clinic. Advertisement Little seems to explain why a month ago, accompanied by another woman, she approached the entrance to a music festival in Moscow and blew herself up. The blast killed only her, but the other woman detonated her own suicide bomb moments later, killing...