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HOLLOW FLASHLIGHT
15-year-old builds flashlight powered by body heat: How her hollow aluminium tube generated electricity to keep an LED lit for more than 20 minutesA 15-year-old Canadian student built a battery-free flashlight that uses the temperature difference between a warm human palm and cooler ai...- Real-life invisibility cloak makes objects vanishGerman scientists have developed a real-life 'Harry Potter-style' portable invisibility cloak that can effectively shield small objects.
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