A Natural Turn of Events: Construction in Toronto has led to the creation of a long spit of land - the Leslie Street Spit - which is turning into a prime nesting location for many kinds of birds, and also for migrating Monarch butterflies. Kidney Transplant: Kidney dialysis and transplants, with Dr. Michael Robinette of the Toronto General Hospital. Kelp: A look at kelp harvesting in China, and the products that can be made from it.