Billions of years ago, Venus may have harbored life-giving habitats similar to those on the early Earth. Today, Earth's twin is a planet knocked upside down and turned inside out. Its burned-out surface is a global fossil of volcanic destruction, shrouded in a dense, toxic atmosphere. Scientists are now unveiling daring new strategies to search for clues from a time when the planet was alive.

An exploration of the appeal of horror films, with interviews of many legendary directors in the genre.

Filmmaker Roman Polanski and photographer Ryszard Horowitz meet in Kraków, Poland, where, strolling the streets, they share memories of their childhood and youth, the hardest days of their lives, when, during World War II, they met in the ghetto established by the Nazi occupiers.

Tragedy struck when the Space Shuttle Challenger disintegrated just 73 seconds into flight. Hours earlier, engineers argued to cancel the launch, amid fears of such a tragedy – so why did it go ahead?

Concorde was an icon of the skies, but on 25 July 2000, Air France Flight 4590 left Paris for New York and caught fire during take-off before crashing to the ground just over a minute later, killing everyone on board. The tragedy brought an end to the dream of supersonic passenger flight. But what caused the disaster? Investigators, survivors’ loved ones and those who examined the wreckage recall the tragedy and describe how the evidence led to a shockingly simple conclusion about what went wrong.

Mariam, Asiya, and Anissa were 11, 7, and 5 years old when they were raped. The attackers were their paternal uncle, a neighborhood youth, and the nanny's son. They have no memory of the event. To protect them, their bodies developed traumatic amnesia. Years later, the memories returned, and they decided to file a complaint.