TV What We Still Don't Know - Season 1 Episode 2 : Why Are We Here? What We Still Don't Know - Season 1 Episode 2 : Why Are We Here? /10 by 0 users Everything you thought you knew about the universe is wrong. It’s made of atoms, right? Wrong. Atoms only account for a measly 15% of everything that exists. The mass of the universe consists of something so mysterious and elusive that it has been dubbed ‘dark matter’. Details Casts Posters Images Title What We Still Don't Know - Season 1 Episode 2 : Why Are We Here? Alternative Titles First Air Date 2004-01-01 Last Air Date 2004-01-01 Number of Episodes 3 Number of Seasons 1 Genres Documentary, Networks Channel 4, Casts Martin Rees, David Malone Plot Keywords , Self - Host Martin Rees Self-host David Malone Episodes List What We Still Don't Know Season 1 :Episode 1 Are We Alone? Are We Alone? 2004-01-01 Thought provoking Channel 4 series in which Sir Martin Rees investigates the great unanswered questions of science. What We Still Don't Know Season 1 :Episode 2 Why Are We Here? Why Are We Here? 2004-01-01 Thought provoking Channel 4 series in which Sir Martin Rees investigates the great unanswered questions of science. What We Still Don't Know Season 1 :Episode 3 Are We Real? Are We Real? 2004-01-01 Thought provoking Channel 4 series in which Sir Martin Rees investigates the great unanswered questions of science.