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A Silicon Valley scientist and entrepreneur who invented a drug to explode double chins is now working on a cure for aging

Nathaniel David’s father began suffering from the symptoms of early-onset osteoarthritis in his back during his teenage years. The 77-year-old is now stooped over, effectively crippled, and unable to move. David started feeling muscle tightness in his back two years ago, at age 47.  An MRI confirmed what he knew was his likely genetic fate: He…