The Optimist Daily has reported on a number of inventions that use ultraviolet (UV) microorganisms' radiation as a sanitation tool, like this door handle or this mask decontamination machine. It seems lighting may be the future solution to quickly and safely zap away harmful microorganisms. A Read More...
Every day we have a choice in which appliance to use. The kettle or the stove? A bath or a shower? Most of the time it's convenience and habit that automatically choose between our options. However, it may be useful to pause for a second and consider which is more efficient in terms of costs and Read More...
Anyone who lives in a big city knows that stars are a rare sight due to light pollution, but that may soon change in one American metropolis. Pittsburgh, Pennsylvania has announced that it will become a dark sky city in 2022, joining others like Tucson and Sedona in Arizona, and Fulda in Germany in Read More...
Distributing solar-powered lights and phone chargers where they are needed the most, while giving low-income women the opportunity to earn supplementary income—such is the vision behind Solar Sister, a social enterprise with a presence in Tanzania, Uganda and Nigeria. With 1,500 women involved in Read More...