India, Dec. 26 -- Every evening, around 5pm, 69-year-old Geeta Chibbar's house transforms into a classroom for children from nearby slum clusters. Surrounded by a circle of around four to five children, Chibbar says, "Education is not a luxury, but a necessity."

In 2018, Chibbar moved from Delhi to Gurugram Sector 45, after working 30yearsin the Oral History department at the Nehru Museum in Teen Murti Bhavan, New Delhi. After retiring, she said, she started learning classical singing, a dream of hers. However, it was not enough. She began asking herself one question repeatedly: What next?

According to Chibbar, she finally got an answer to her question, when her house help told her that her children studying in classes 5 and 6 at a gove...