Article 36: The genus ‘Homo’ is the youngest twig from a 2.5 million year old branch from a 4.6 billion year old tree, a seedling in a 13.8 billion year old universe. You and I are a recent leaf, or maybe a flower, on that twig!

Article 35: During the present Ice Age, temperate zones are alternately covered by glaciers, during glacial periods, and uncovered during interglacial periods, when the glaciers retreat, like the period we are living in right now.

Article 34: The Pleistocene is characterized by the presence of large land mammals, like mammoths and mastodons. This period also sees the evolution and expansion of our own species, Homo sapiens.