The maker movement is promising to reshape our relationship with the design and manufacture of computers and electronic devices by bringing a DIY approach into this field that has - so far - remained the exclusive domain of big industry. At the heart of this revolution is the Arduino - a tiny, sky blue circuit board. We meet Italian technology designer Massimo Banzi at the Maker Faire in Shenzen, in southeastern China. He is there to talk about his creation, the Arduino, the open-source computer control device that has fuelled a movement of 'makers'. Thousands of people are adopting Arduino to build everything from 3-D printers to drones, smart home devices to robotics. As much as he is seen as a minor deity by the tech community, he is equally humbled by them, and by their creativity and passion. He believes Arduino is an accessible tool that can help anyone design and invent, help people do something differently, and bring about social change. Across the Pacific, widespread anxiety amongst the Japanese about the nuclear fallout in Fukushima has inspired former journalist Kiki and other volunteers to take action. They built their own Geiger counters using Arduino, established a citizen-based monitoring network and realised that official stations were systematically underestimating the radiation risks. These volunteers are now Safecast, an NGO dedicated to citizen monitoring, and Kiki takes us to their workshop in Fukushima, where they make all their own devices. Koriyama and Aizu are making a bicycle bristling with sensors which will collect a whole host of environmental data wherever it goes, while others are engineering radiation sensors attached to solar panels to devices that collect and monitor seaweed from the Japanese coast.