Sometimes you start something and have no idea where it will lead. So it was with Eduardo Filgueiras, a struggling guitarist whose family worked in an unusual business in Rio de Janeiro: They farmed toads. Filgueiras figured out a way to take the small toad skins and fuse them together, creating something large enough to sell.
Meanwhile miles away in the Amazon, a fisherman and a scientist were coming up with an innovation that would help save a key, giant fish that thrives in freshwater lakes alongside Amazon River tributaries.
