How Peter Thiel Is Trying to Save the WorldThese startups are trying to beat Alzheimer's, cure viral diseases, and kill tumors with gold. One common thread: funding from Peter Thiel. In 2010, Brian Frezza and D.J. Kleinbaum were four hours from leaving Silicon Valley for good. Since childhood, the two best friends had been incubating a shared dream of using computer science to cure diseases. They