PBS, with more than 330 member stations, offers all Americans the opportunity to experience the worlds of science, history, nature and public affairs; to hear diverse viewpoints; and to take front row seats to world-class drama and performances.

Three ordinary people search for humanity's true place in the cosmos.

Genius by Stephen Hawking

Where Are We?

Self-assembling machines, light-up bacteria and a physical demonstration of evolution revolutionize volunteers' views of life.

What Are We?

PBS national service provided by local public television stations nationwide.

PBSNET

Stephen Hawking challenges three people to ponder the likelihood of alien life.

Are We Alone?

Stephen Hawking considers whether time travel is possible; ideas include DeLoreans, atomic clocks, a giant black hole and a large swath of New York.

Can We Time Travel?

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Stephen Hawking challenges volunteers and viewers to consider some of humanity's greatest questions.

S1 E2 | Are We Alone?