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Heaven and Hell

   1980    Science
Sagan discusses comets and asteroids as planetary impactors, giving recent examples of the Tunguska event and a lunar impact described by Canterbury monks in 1178. It moves to a description of the environment of Venus, from the previous fantastic theories of people such as Immanuel Velikovsky to the information gained by the Venera landers and its implications for Earth's greenhouse effect. The Cosmos Update highlights the connection to global warming.
Series: Cosmos
Enemies of Reason
Enemies of Reason

      Medicine
Natural World
Natural World

   2009    Nature
Dangerous knowledge
Dangerous knowledge

   2007    Science
Hiroshima
Hiroshima

   2005    History
Bronze Age
Bronze Age

   2016    History
Wings
Wings

      Nature
Becoming Human
Becoming Human

   2010    History