Colombia's plan to turn coca-leaf farmers into coffee growers has a fatal flaw: the market.
How and why these bizarre stars of Planet Earth II ended up living in icy lakes high in the Andes mountains.
They kill thousands of animals and people every year by spreading rabies. New research findings could solve the problem.
Had the young naturalist not made a great discovery about rock formations in the first half of his career, On the Origin of the Species might never have been written.