A Silicon Valley genome engineering startup founded by former SpaceX engineers called Synthego sells ready-to-use kits that let people experiment with the cutting-edge gene editing tool CRISPR. On Tuesday, Synthego received $110 million from Peter Thiel's Founders Fund and two other Silicon Valley venture firms — bringing the company's total funding to $160 million. CRISPR holds massive promise for a field known as gene therapy, which involves modifying someone's DNA to treat a genetic disease like sickle cell. Synthego sells its CRISPR kits primarily to researchers in roughly 50 countries.