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

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

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

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

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

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

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

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

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

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

Joked about comedy, the making of Seinfeld, and his web series 'Comedians in Cars Getting Coffee'.

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

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

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

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

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

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