Third, the number of patents per invention varies widely across industries. In the high-tech space, one big invention, like the iPhone, is covered by at least 200 patents, and likely closer to 400. But in the biotech and pharmaceutical world, one invention, like a new drug, is often only covered by a single patent. This point is critical for Baltimore and Maryland because biotech and the life sciences — not social networking apps — are what the Baltimore-Washington corridor does best. The Johns Hopkins University, the National Institutes of Health, and the University of Maryland, at College Park, Baltimore County, and the Biotechnology Institute (as well as these institutions' various spin-offs) are all focused significantly on life sciences. One should therefore expect Baltimore and Maryland to have substantially fewer patent applications than, say, California.