絕交、分手必備神器

China's decades-old network of elite high-school "genius classes" -- ultra-competitive talent streams that pull an estimated 100,000 gifted teenagers out of regular schooling every year and run them through college-level science curricula -- has produced the core technical talent now building the co...

NASA’s Curiosity rover has produced a rare nighttime close-up on Mars by using LED lights on its robotic arm to illuminate a drilled rock target called “Nevado Sajama,” an image NASA recently featured from observations made on December 6. The photo was taken with Curiosity’s Mars Hand Lens Imager (MAHLI), which can capture true-color images at 1,600 by 1,200 pixels and includes both ultraviolet and white LEDs for imaging in darkness. Beyond the striking visuals, the lighting serves a practical science purpose: it lets researchers examine surfaces that can remain “deep in shadow during the day,” helping Curiosity continue its long-running work of studying Martian rocks for clues about the planet’s past, including signs of ancient life. The coverage also notes that Martian nights last a little over 12 hours on average and can get extremely cold, with temperatures dropping to around −100°F near the equator—conditions that make this kind of hands-on robotic fieldwork especially challenging and impressive.