Volcano-climbing teachers, wheelchair-dancing artists and volunteers who build schools out of plastic bottles were among those taking part in the Technology, Entertainment, Design (TEDX ) conference held in Guatemala City on March 24. The event was the third of its kind held in the city and now the most widely attended. More than 450 people filled the Juan Bautista Gutierrez Auditorium of Francisco Marroquín University to listen to speakers present innovations in technology, education and development.