Theranos

Theranos promised to revolutionize blood testing with a finger-prick device that could run 200+ tests on a single drop of blood. At its peak in 2014, the Silicon Valley startup was valued at $9 billion, making founder Elizabeth Holmes the youngest self-made female billionaire. The technology was a fraud — Theranos was secretly running samples on conventional machines. Holmes was convicted of criminal fraud in 2022 and sentenced to 11 years in federal prison.