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Mac software isn't really my thing, but I've been asked by a friend to investigate a slightly bizarre looking failure. Apparently the message "start up disc is full" has been seen at some point (that's how it was quoted to me but I suspect it probably used the American spelling). Please, has anyone any ideas as to what on Earth is happening and how to fix it?
#Apple #Mac #MacBookAir #Error #Failure
Thanks in advance!

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Felix Vallotton - Sleeping Woman

#FelixVallotton #painting #art



#Physics
Scientists achieve single-photon imaging over 200 kilometers


Astronomy Picture of the Day
2021 April 13
Confirmed Muon Wobble Remains Unexplained
Image Credit: Fermi National Accelerator Laboratory; Photographer: Reidar Hahn
Explanation: How fast do elementary particles wobble? A surprising answer to this seemingly inconsequential question came out of Brookhaven National Laboratory in New York, USA in 2001, and indicated that the Standard Model of Particle Physics, adopted widely in physics, is incomplete. Specifically, the muon, a particle with similarities to a heavy electron, has had its relatively large wobble under scrutiny in a series of experiments known as g-2 (gee-minus-two). The Brookhaven result galvanized other experimental groups around the world to confirm it, and pressured theorists to better understand it. Reporting in last week, the most sensitive muon wobble experiment yet, conducted at Fermi National Accelerator Laboratory (Fermilab) in Illinois and pictured here, agreed with the Brookhaven result. The unexpected wobble rate may indicate that an ever-present sea of virtual particles includes types not currently known. Alternatively, it may indicate that flaws exist in difficult theoretical prediction calculations. Future runs at Fermilab's g-2 experiment will further increase precision and, possibly, the statistical difference between the universe we measure and the universe we understand.

apod.nasa.gov/apod/astropix.ht…

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#Bananas. (5 photos)
How Ancient Tooth Plaque Solved the Mystery of the Banana’s Trans-Pacific Journey
3,000-year-old microparticles prove the fruit traveled across the ocean with early Pacific Islanders.

(photo description An herbarium specimen of cutnut, a plant that remains important in Vanuatu diets today. Tromp used herbarium specimens to compare ancient phytoliths)

atlasobscura.com/articles/wher…