NEXT GENERATION: "They are the source of my hope." Former President Obama speaks at the groundbreaking of his presidential library in Chicago about the work young people are doing to make the world a better place.
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On Monday, Elon Musk became the third person ever to amass a fortune worth $200 billion, surpassing Amazon founder and rival space billionaire Jeff Bezos in the process. Here's a timeline of their journey to the top: trib.al/HeTc4rQ