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#things

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The Open Buddhist University

📼 How One Company Secretly Poisoned The Planet (A ✨NEW✨, free, 54-minute video)

Tags: #Chemistry #Pollution #Things
buddhistuniversity.net/content

The Open Buddhist University · How One Company Secretly Poisoned The PlanetThe trouble is that the same carbon-fluorine bonds that make PFAS so stable and useful in consumer products also make them incredibly persistent in the environment. Which is why you might also know PFAS under a different name: ‘forever chemicals.’ They have been found everywhere from bustling cities to untouched areas of wilderness. Every continent, including Antarctica, has PFAS all over it. Almost every living creature, from polar bears to birds to fish to humans, this stuff is now everywhere.
The Open Buddhist University

📰 12,000-Year-Old Spindle Whorls and the Innovation of Wheeled Rotational Technologies (A ✨NEW✨, free, 22-page article)

Tags: #HistoryOfTechnology #Prehistory #Things
buddhistuniversity.net/content

The Open Buddhist University · 12,000-Year-Old Spindle Whorls and the Innovation of Wheeled Rotational Technologies‘The wheel and axle’ revolutionized human technological history by transforming linear to rotary motion and causing parts of devices to move. While its ancient origins are commonly associated with the appearance of carts during the Bronze Age, we focus on much earlier wheel-shaped find: an exceptional assemblage of over a hundred perforated pebbles from the 12,000-year-old Natufian village of Nahal Ein-Gev II, Israel. We analyze the assemblage using 3D methodologies, incorporating novel study applications to both the pebbles and their perforations and explore the functional implications. We conclude that these items could have served as spindle whorls to spin fibres. In a cumulative evolutionary trend, they manifest early phases of the development of rotational technologies by laying the mechanical principle of the wheel and axle.
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