The rainforests are also the source of many things that are useful to human beings. As many as one out of every four drugs bought at the store were discovered in rainforest. Coffee, chocolate, bananas, corn, tea, sweet potatoes, Brazil nuts, rubber, and tapioca all came from the rainforest. Very valuable wood is taken from the trees of the rainforest. Mahogany, teak, and balsa wood come from there. Those trees can not be grown without the thick, wet, warm rainforests. Thus, the loss of the rainforests would hurt other people besides those that must live there.