The Frontiers of Science & History with A.C. Grayling
Dan Snow's History Hit
00:00
The Last Person Who Knew Everything
Sisanalips is a professor of history at the University of California, San Francisco. He says that in his own grandfather's lifetime, he was completely ignorant about any past deeper than classical antiquity. Sisanalips: We have access to less than five percent of the mass density of the universe. More than 95 % of the universe, we have no idea at all how dark matter and dark energy works.
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