Stephen Hawking considers whether time travel is possible; ideas include DeLoreans, atomic clocks, a giant black hole and a large swath of New York.
Stephen Hawking challenges three people to ponder the likelihood of alien life.
Stephen Hawking prompts three people to think like philosophers as well as scientists as they assess why humans exist.
Stephen Hawking leads three people on a journey of discovery featuring racing cars, ice skaters, balloons and running tracks.
Self-assembling machines, light-up bacteria and a physical demonstration of evolution revolutionize volunteers' views of life.
Three ordinary people search for humanity's true place in the cosmos.
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