Mixing powerful and deeply moving footage with telling forensic analysis, Horizon reveals what really went wrong with space shuttle Columbia and how crew and ship could have been saved.
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See all broadcasts of Last Flight of Columbia (1)
Can Dr Chris van Tulleken and Prof Tanya Byron help 75 members of the public lose weight?
Liz Bonnin and cat experts use GPS and cameras to follow cats in different environments.
Celebrate 50 years of Horizon with this free downloadable ebook for tablets.
Entire episodes chosen to celebrate the show's 50th anniversary, starting from 1964.