The Guinness Book of World Records has given its seal of approval to the “largest practical science lesson” conducted by 2,000 school students in Delhi as part of the recently-concluded India International Science Festival at IIT. The confirmation from the Guinness Book came days after the school students bettered the existing world record in the category, set by a group of 1,339 Irish students. “The largest practical science lesson is 2,000 participants, achieved by Vijnana Bharati (India), in Delhi on December 7, 2015. Participants worked in small teams to complete experiments as part of the lesson that focused on catalysts,” the Guinness Book mentioned on its website. An official announcement regarding the same was made at a press conference at IIT Delhi on Thursday. “The Guinness Record will have a cascading effect on the young scientific community. It will create huge curiosity and affinity among school children towards science,” IIT Delhi Director Khsitij Gupta said. The students had attempted the award-making experiment on December 7 as part of the festival at IIT Delhi.