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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.0Forensic History: Crimes, Frauds, and Scandals S1 Ep1: The Infamous Jack the RipperForensic knowledge and the media; studying the Jack the Ripper murders from the late 1880s, considered a landmark case for crime reporting; investigating the continuous interplay between forensic advances and larger societal changes.