It appears that innovation is contagious. Maps reveal that once there is a concentration of patents granted to inventors in one U.S. county, innovation starts to percolate in neighboring counties. And the phenomenon isn’t found only in established life sciences hubs like San Diego or Boston. SSTI observed this spillover effect in Washtenaw County, Michigan and Hennepin County, Minnesota, among other places. These data suggest that when a strong base is located, likely due to new companies and startups establishing themselves, innovation lays down its roots and spreads to other counties.