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Scientists at Kyushu University in Japan have pulled off something that sounds almost like a physics magic trick taking ordinary visible sunlight and converting it into ultraviolet light using a newly designed solid-state material. The material works by combining the energy of two low-energy photons to produce a single, higher-energy UV photon, a process called photon upconversion.

When people navigate a new city or choose a restaurant in an unfamiliar area, they often rely on the wisdom of crowds. We consult the digital maps that track the movements of thousands of other commuters to avoid traffic jams, and we read dozens of internet reviews before spending our money.

Imagine an animal that began its life centuries before the Roman Empire reached its height and has quietly continued its daily routine ever since. According to recent reports, scientists have identified a giant Caribbean sponge believed to have lived for around 2,300 years, making it one of the oldest animals ever documented.

Seventy years can feel like a long enough stretch for an ecological experiment to settle into history, but the story of rabbits and a deliberately released virus keeps refusing to stay still. What began as a blunt attempt to rein in an exploding pest population has turned into something messier, almost reluctant in its persistence.