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Keeping cool in the heat with a millennia-old tradition in India, a German company making animal-free medical tests, and building from bottles in Mozambique. A traditional way to manage extreme temperatures As India grapples with longer, more frequent and more severe heatwaves, access to cooling or even a refrigerator remains out of reach for millions. In New Delhi, many households rely on the matka – a traditional clay pot that uses evaporation to keep water cool. It’s an affordable alternative for homes without refrigerators. The same centuries-old principle is now inspiring modern solutions such as CoolAnt, a terracotta-based cooling system that lowers air temperatures in interior spaces, using water and natural airflow. Supporters say such low-cost, energy-efficient technologies could help vulnerable communities adapt while reducing dependence on air conditioning. Home medical tests that don't hurt animals A German start-up has developed what it says is the world's first pregnancy test made without antibodies from animals such as rabbits or mice, the test uses marine microalgae. The European Union-certified product has been on sale since 2025. Its founders hope the technology will make diagnostic testing more sustainable while helping reduce the use of animals in medical research. Building with discarded plastic and glass In northeastern Mozambique, a project called Yopipila – meaning "green” in the local Emakua language – is helping young people turn waste into opportunity. Supported by the Hakuna Matata Foundation, participants in Cabo Delgado learn eco-friendly techniques to build community facilities from discarded plastic and glass bottles, bamboo, earth and recycled tyres. The training promotes sustainable construction while creating skills and green income opportunities in a region with limited jobs and little recycling infrastructure. For many participants, the project offers both environmental solutions and a pathway to a more secure future. Edited by: Anke Rasper