Extreme heat shuts schools for millions, widening learning gaps worldwide

Hena Khan, a grade nine student in Dhaka, has struggled to focus on her studies this week as temperatures surpassed 43 degrees Celsius (109 degrees Fahrenheit) in the Bangladesh capital.

"There is no real education in schools in this punishing heat," she said. "Teachers can't teach, students can't concentrate. Rather, our lives are at risk."