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Cosmology: The History and Nature of Our Universe S1 Ep8: Distances, Appearances, and HorizonsProfessor Whittle defines distances in cosmology; the three important distances to consider is the emission distance when the light is set out; the current distance, when the light arrives; the distance the light travels.

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Now PlayingCosmology: The History and Nature of Our Universe S1 Ep8: Distances, Appearances, and HorizonsProfessor Whittle defines distances in cosmology; the three important distances to consider is the emission distance when the light is set out; the current distance, when the light arrives; the distance the light travels.0The Rise of Humans: Great Scientific Debates S1 Ep1: Ramapithecus-Ape ManIllustrating scientific debates over the rise of humans; the ancestry casts Ramapithecus out; witnessing fossil evidence and molecular evidence, working both together and independently; explaining some of anthropology's most complex issues.