Children study in a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

Children study in a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

Children study in a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

Girls walk to a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

Children study in a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

A girl walks to a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

Children study in a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

A child walks with his father towards fields near a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)

A girl studies in a makeshift school under a metro bridge in New Delhi, India, April 12, 2022. The free school underneath the metro bridge is run by a group of undergraduate students for children who come from the slums situated adjacent to the Yamuna river. (Xinhua/Javed Dar)