This document discusses hackathons, which are events where computer programmers and others collaborate to code working prototypes from scratch within a short period of time. It provides a brief history of hackathons from the 1970s to today, including examples like civic, college, energy, and corporate hackathons. The document promotes a hackathon focused on finding innovative solutions for urban green living and sustainable cities. It lists partners supporting this cause and notes that the European Union funds high-potential innovation through its Horizon 2020 program.