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Discussed healthcare, net neutrality, and the White House beer recipe.

Talked about philanthropy, future of technology, and eradication of diseases.

Answered questions about the universe, promoted science education and his show Cosmos.

Joked about his show, his super PAC, and his love of Tolkien.

Discussed SpaceX, renewable energy, and the future of electric vehicles.

Shared cooking tips, tough love advice, and stories from his TV shows.

Talked about his acting career, personal philosophy, and his love for motorcycles.

Discussed conservation, chimpanzees, and her hope for the future of the planet.

Talked about science advocacy, climate change, and space exploration.

Answered questions about the gaming industry, Valve Corporation, and the highly-anticipated Half-Life 3.

Shared his experiences as an astronaut, the importance of space exploration, and insights from living in space.

Talked about privacy rights, mass surveillance by governments, and the NSA documents he leaked.

Discussed his bodybuilding career, time as governor of California, and experiences in the film industry.

Talked about WikiLeaks, freedom of the press, and the ethics of government transparency.

Answered questions on space travel, walking on the moon, and Mars colonization.

Discussed his acting career, including his role in Game of Thrones and thoughts on the entertainment industry.

Shared insights on his Olympic swimming career, mental health, and life after retirement.