When looking at a pair of old chopsticks, most people would see nothing but waste. But Felix Bock would see boxes, tables, shelves and so on.

In 2016, Felix Bock, a doctoral student at the University of British Columbia, Canada, found out people threw away about 100,000 pairs of chopsticks every day in Vancouver alone.

Carmen Elcira still had a gurgle of laughter in her chest when Filiberto Berto stood and told the class, “You can call me B.B.”