As Ukraine enters the second year of the full-scale Russian invasion, we hear about an app through which citizens can help alert defence authorities of air attacks. To help prevent future attacks, the country’s Air Defence Forces want people to use their phones to report hostile airborne objects. Simply install an app, point your handset at the object, select the category – say a drone or a missile - and press the button. It means observers on the ground can pick up objects flying too low for radar detection. Gareth speaks to one of the app’s developers, Gennadiy Suldin of the tech start up NGO Technari. Supercomputing predicting weather in Brazil – has it worked? The clear up continues in Sao Paulo following last week’s devastating floods and landslides, which have claimed dozens of lives. But could these extreme weather events have been better predicted with supercomputers? Angelica Mari has been asking if Brazil’s supercomputers are super enough? Spotting illegal farms in Taiwan with citizen tech With 1500 hectares of farmland lost to illegal usage each year in Taiwan, an environmental advocacy group tried to find ways of bringing this attention to the wider public. Stuck for what to do and not wanting to use conventional means like petitions, they turned to Taiwan’s volunteer technology community for inspiration. Shiroma Silva went to find out more for Digital Planet.The programme is presented by Gareth Mitchell with expert commentary from Angelica Mari. Studio Manager: Giles Aspen Producer: Ania Lichtarowicz(Image: A drone approaches for an attack in Kyiv on 17 October 2022. Credit: Yasuyoshi Chiba/AFP/Getty Images)