Silicon Valley is home to some of the biggest names in technology. It's also home to many rich people who have made their money at the cutting edge and are willing to invest in ideas that might be the next big thing.

Alastair Leithead meets those who have come to Silicon Valley hoping to sell their ideas, as well as the people who've done it before and are happy to share their advice.

From companies wanting to mine the moon, to friends developing apps for mobile phones, Silicon Valley is the place most likely to the have the next tech billionaire.

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