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IMAGE: A new MIT-fabricated metalens shifts focus without tilting, shifting, or otherwise moving. The design may enable miniature zoom lenses for drones, cellphones, or night-vision goggles. view more
Credit: Image courtesy of Tian Gu, et al
Polished glass has been at the center of imaging systems for centuries. Their precise curvature enables lenses to focus light and produce sharp images, whether the object in view is a single cell, the page of a book, or a far-off galaxy.
Changing focus to see clearly at all these scales typically requires physically moving a lens, by tilting, sliding, or otherwise shifting the lens, usually with the help of mechanical parts that add to the bulk of microscopes and telescopes.
New metalens shifts focus without tilting or moving
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New metalens shifts focus without tilting or moving
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The WeChat model: How Facebook’s Australian ban could change the business of news
If the current situation continues, it may leave Facebook operating much more like the Chinese platform WeChat, where news is ruled by platform-specific content houses cranking out huge volumes of low-quality articles.
Feb. 22, 2021, 9:21 a.m.
Last week, in response to Australia’s proposed media bargaining code, Facebook effectively halted all posting of links from Australian news pages and stopped people in Australia from posting or viewing international news as well.
The change, which has sent publishers’ traffic tumbling, happened overnight, and may be undone if either Australia or Facebook backs down. But if the current situation continues, it may leave Facebook operating much more like the Chinese platform WeChat, where news is ruled by platform-specific content houses cranking out huge volumes of low-quality articles. And that might suit Facebook quite well if not the public.