Silicon Valley venture firm Andreessen Horowitz is launching a second fund that will focus on biology, investing $450 million. This one, building on the experience a16z has had with its first biofund, which launched in 2015 with $200 million, will focus on the intersection of biology and engineering. The fund will focus on investing in companies applying engineering to things like drug discovery, creating new uses for biology, and finding new ways for software to "eat" healthcare. The venture capital firm with a tagline that "software is eating the world" thinks the same could happen with biology.