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During WWII, she invented a device that used only sunlight to turn ocean water into drinking water—and it fit in a life raft.Her name was Mária Telkes, and most people have never heard of her. But military pilots and sailors stranded in the Pacific certainly knew her name—because her invention kept them alive.Born in Hungary in 1900, Mária earned her PhD in physical chemistry from the University of Budapest in 1924. A year later, she immigrated to the United States with her scientific training, her ambition, and an idea that seemed almost like magic: what if we could harness the sun's energy to solve practical problems?When World War II broke out, the U.S. military faced a deadly challenge: downed pilots and shipwrecked sailors stranded at sea often died not from injuries, but from dehydration. Surrounded by water they couldn't drink. Mária Telkes solved it.She developed the Telkes solar still—a portable, inflatable device made of clear plastic that could be packed into life rafts and emergency kits. Using nothing but sunlight, it evaporated seawater, then condensed the pure water vapor, leaving the salt behind.The device could produce about one quart of fresh drinking water per day. That doesn't sound like much—until you realize one quart per day is the difference between life and death for someone floating in the Pacific Ocean.The military added her solar stills to life rafts throughout the Navy and Air Force. They remained standard emergency equipment into the 1960s. No one knows exactly how many lives the device saved, but "countless" isn't an exaggeration—every pilot, every sailor who survived long enough to be rescued because they had fresh water owed their survival, in part, to Mária Telkes. Her colleagues started calling her "The Sun Queen."But she wasn't done.After the war, while most solar research was still considered fringe science, Mária was already building the future. In 1948, working with architect Eleanor Raymond and funded by philanthropist Amelia Peabody, she designed and built the Dover Sun House in Massachusetts.It was the first residential building in the world heated entirely by solar power.The system was ingenious: solar collectors on the south-facing roof captured the sun's heat during the day. But here's the revolutionary part—Mária developed a chemical storage system using Glauber's salt (sodium sulfate) that could store that heat and release it slowly at night and on cloudy days.Think about that. In 1948—when most homes were heated by coal or oil, when "solar power" sounded like science fiction—Mária Telkes built a house that stayed warm using only the sun. No furnace. No fossil fuels. Just chemistry and sunlight.The Dover Sun House worked successfully for three winters before technical issues emerged (the salt eventually degraded and heating became uneven). But the concept was proven. It was possible.She had shown the world that solar heating wasn't a dream—it was engineering. Mária continued her work for decades. She held over 20 patents. She developed thermoelectric devices for NASA. She pioneered phase-change materials for thermal energy storage—the same basic concepts used in modern solar thermal systems today.In 1977, the American Solar Energy Society gave her their Lifetime Achievement Award. She was 77 years old and still working, still innovating, still pushing the boundaries of what solar energy could do. Mária Telkes died in 1995 at age 95. By then, solar panels were becoming common, residential solar heating was an established technology, and the renewable energy revolution she'd helped pioneer was finally gaining momentum.Today, when you see solar panels on a roof, when you hear about thermal energy storage, when you read about concentrated solar power plants—you're seeing the legacy of "The Sun Queen."She proved that Hungarian immigrant with a chemistry degree could change the world. That sunlight—free, abundant, democratic—could be harnessed to save lives and heat homes. That women belonged in laboratories and on the cutting edge of innovation.During WWII, when pilots were being shot down over the Pacific, Mária Telkes gave them a chance to survive until rescue arrived. And she did it with nothing but plastic, sunlight, and brilliant engineering.Some inventors create luxuries. Mária Telkes created survival.The sun has always been there, pouring energy onto Earth. Mária Telkes just taught us how to use it.