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The Senate in Berlin and the federal government have decided to end the compulsory wearing of masks on local and long-distance public transport.
The apparent suicide of an Austrian physician and supporter of COVID-19 vaccination raises troubling questions about online hatred and the adequacy of the official response to it.
The death of Austrian doctor Lisa-Maria Kellermayr has sparked fresh calls for better protection of medical professionals against abuse. Police are investigating suspects in Germany.
Perovskite is a promising material. It captures the sun’s rays and efficiently converts them into solar energy. It is also much cheaper than the
Date Time Why perovskite solar cells tend to segregate under influence of light Solar cells made of perovskite are cheap, easy to produce, and almost as efficient as silicon, the material traditionally used in solar cells. However, perovskite cells have a love-hate-relationship with the Sun. The light that they need to generate electricity also happens to impair the quality of the cells, thus severely limiting their efficiency and stability over time. Researchers at Eindhoven University of Technology have now developed a theory that explains why compound perovskite cells are unstable in sunli...