TV What We Still Don't Know What We Still Don't Know /10 by 0 users Thought provoking Channel 4 series in which Sir Martin Rees investigates the great unanswered questions of science. Details Casts Posters Images Title What We Still Don't Know 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