How a Groupon co-founder's experience with a lack of cancer data led him to start a company that's now worth $2 billion after just three years

Eric Lefkofsky, chief executive officer of biotechnology company Tempus, arrives for a morning session of the annual Allen & Company Sun Valley Conference. Drew Angerer/Getty…

Read More How a Groupon co-founder's experience with a lack of cancer data led him to start a company that's now worth $2 billion after just three years

'This test is garbage': Experts and former employees allege that a Silicon Valley startup gives bogus 'cellular ages' based on a flawed blood test

A Silicon Valley blood-testing startup called Telomere Diagnostics sells a $99 kit that tells customers the average length of their telomeres. Telomeres are seen by…

Read More 'This test is garbage': Experts and former employees allege that a Silicon Valley startup gives bogus 'cellular ages' based on a flawed blood test