This image provided by Nasa shows the SpaceX Dragon cargo craft just prior to being released by the International Space Station's Canadarm2 robotic arm in 2012. Photo: AP/Nasa

The pet projects Elon Musk, Jeff Bezos and other billionaires spend their fortunes on – from space travel to immortality

If you had a spare US$1 billion or US$100 billion, what would you spend your money on? These men could have anything in the world, but they want more as they push the boundaries of health, science and infrastructure

Topic |   Fame and celebrity

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This image provided by Nasa shows the SpaceX Dragon cargo craft just prior to being released by the International Space Station's Canadarm2 robotic arm in 2012. Photo: AP/Nasa
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Simon O'Reilly

Simon O'Reilly

Simon is a sub-editor who occasionally moonlights as a writer. He has lived in Hong Kong for 25 years, he lives in south Lantau and his hobbies include playing guitar and getting old.