Open Science is about science communication. It is also about how we address the profound challenges which now confront humanity climate, the food crisis, environmental degradation, resource scarcity and disease. All of these necessitate the sharing of scientific knowledge among seven soon to be nine billion humans, on a scale never before attempted. Based on many years of experience in media and science communication, it describes lowcost, effective means to transfer knowledge to target audiences in industry, government, the community and to the public at large.