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On an infrared camera, a warm object normally stands out clearly against its cooler surroundings. Researchers at the University of Illinois Urbana-Champaign have now built a three-dimensional cloak that bends heat around an object entirely, erasing its thermal outline while keeping the space inside protected from extreme temperatures.

Two decades after the Pokhran-I nuclear test in 1974, India was ready to test again in 1995. But American spy satellites spotted unusual activity at Pokhran before it could. This is why PM PV Narasimha Rao withheld the final clearance, and the move helped pave the way for the successful Pokhran-II tests three years later.