Students visit a science exhibition during the International Science Festival in Kolkata, India on Nov. 8, 2019. The International Science Festival is held in Kolkata from Nov. 5 to 8. (Photo by Tumpa Mondal/Xinhua)
Students visit a science exhibition during the International Science Festival in Kolkata, India on Nov. 8, 2019. The International Science Festival is held in Kolkata from Nov. 5 to 8. (Photo by Tumpa Mondal/Xinhua)
People visit a science exhibition during the International Science Festival in Kolkata, India on Nov. 8, 2019. The International Science Festival is held in Kolkata from Nov. 5 to 8. (Photo by Tumpa Mondal/Xinhua)