
A Polish adventure skier has made history by becoming the first person to climb up and ski down Mount Everest without the use of additional oxygen. The ascent was Andrzej Bargiel’s third attempt at climbing Everest – the tallest mountain on earth at 29,032ft high – after dangerous conditions forced the 37-year-old to abandon earlier attempts in 2019 and 2022. More than 6,000 people have climbed the mountain, but only about 200 have done it without additional bottled oxygen. A few people have skied back down, but never a continuous downhill without supplementary oxygen. It took nearly 16 hours on Monday for Bargiel to climb through the “death zone”, which is above 8,000 meters where oxygen levels are dangerously low. At the top of the mountain the air is so thin that climbers only get about a third of the oxygen available at sea level. This can cause brain damage, fluid in the lungs, and even death. (via The Guardian)
The oldest and one of the weirdest musical instruments ever invented

Stalactites hang tight to the ceiling, and stalagmites push up with might from the floor: this is a mnemonic device you may once have learned. It would surely be called to mind by a visit to Luray Caverns in the American state of Virginia, home of the Great Stalacpipe Organ. Not long after the discovery of Luray Caverns itself in 1878, its stalactites were found to resonate through the underground space in an almost musical fashion when struck — a property Leland W. Sprinkle took to its logical conclusion in the mid-nineteen fifties. Conception was one thing, but execution quite another: it took him three years to locate just the right stalactites, shave them down to ring out at just the right frequency, and rig them up with electronically activated, keyboard-controlled mallets. This was not hard for the technically minded Sprinkle, who worked at the Pentagon as a mathematician and electronics scientist. (via Open Culture)
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