A teen in Michigan built a working nuclear reactor. He taught himself how to build it as a weekend hobby project in his basement from ages 15-17 for $3500.
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Scientists lit a cave of natural gas on fire in 1971 expecting it to only burn for a few days; it still burns to this day. It has been nicknamed "The Door to Hell".
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A blind American man taught himself to navigate using echolocation. His hobbies include hiking and mountain-biking, and he has now trained over 500 students in his ‘tongue-click’ technique.
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There's a regenerative candle that creates a new candle as it melts.
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