The remnants of a school bag in Betrawati, Nepal, where some 200 students of one school lost their lives in the flooding disaster, Sept. 4, 2026. (Lam Yik Fei/The New York Times) By MUJIB MASHAL and BINOD GHIMIRE Taking a break from the noisy work of leading a school of more than 500 students, Madhav Lamichhane would ride his motorbike down to the riverside Betrawati Bazaar every week. The principal skipped the busy shops around the town’s clock tower, preferring a quiet moment by the Ram…