@sfera314.bsky.social
"Geometry is the measurement of nature with human understanding" [José de Almada Negreiros] Location: Milan, Italy, Europe, north of the south
Teaching electric current.
In the Drude model, electrons move like little balls, bouncing off ions at random.
With an applied electric field they drift, on average, and create a current.
Soundtrack: Pinball Wizard (The Who).
youtu.be/hHc7bR6y06M?...
Aristotele all'anagrafe comunale. L'impiegato non capisce...
Si narra che un giorno Aristotele andò all’anagrafe 🏛️ per un certificato.
Imp.: Nome?
A.: Ἀριστοτέλης (Aristotele)
Imp.: Luogo di nascita?
A.: Stagira
Imp.: Anno?
A.: 384 a.C.
Imp.: Avanti… COSA??? 🤯
“L’io, io!… il più lurido di tutti i pronomi!… I pronomi! Sono i pidocchi del pensiero. Quando il pensiero ha i pidocchi, si gratta come tutti quelli che hanno i pidocchi… e nelle unghie, allora… ci ritrova i pronomi: i pronomi di persona.”
[Carlo Emilio Gadda] (h/t #SergioSchneider)
Una vista dell'arcipelago St. Kilda. (fonte: Google maps + AI).
In un capitolo del suo "A spasso con il cane Luna" (lettura consigliatissima) @gVallortigara ci racconta dell'arcipelago St. Kilda "un luogo ai confini del mondo".
Come ha scritto Borges ("le rovine circolari" ) "Quel cerchio è un tempio che gli antichi incendi divorarono..."
Isn't it "surprising"? (another graphical solution to Kepler's equation)...
... So, planets moves as they do as if they were swung by a gigantic cosmic wave 😳...?!
Credits: Newton's Principia,
Marc Frantz: Some Graphical Solutions of the Kepler Problem scispace.com/pdf/some-gra...
The Physics of fresh eggs
Credit:
www.instagram.com/waystocooke/ waystocooke (Sydnee Cooke)
www.instagram.com/waystocooke/...
Why does the buttered toast (almost) always land butter-side down?
Is it Murphy’s Law?
Is it the universe making fun of you?
No, it's just the laws physics, babe!
Robert Matthews (winner of the Ig Nobel Prize for physics in 1996) took the problem seriously...
youtu.be/zwIfBSbNQCs?...
«È sparito anche il vuoto» è una splendida (ma poco nota) poesia di #EugenioMontale. È stata usata come epigrafe dal fisico #GuidoTonelli in “L’eleganza del vuoto”. Dagli antichi filosofi, alla teoria quantistica dei campi.
Lettura di @assenteistamancato 🔊
youtu.be/fyYYVW9yjGI
Abbado died from cancer on January 2014 at the age of 80, around 3½ years after conducting Mahler’s 9th in Lucerne.
Mahler himself died 1911 about a year after completing that same Symphony.
Both seemed to sense death approaching—and sought to prepare for it.
In August 2010, Claudio Abbado conducted Mahler’s 9th in Lucerne. After the final note, the audience held its breath: 2'24" of a haunting and spooky silence—perhaps the longest ever after a live concert. Listen from 5:20 to 7:44 and enjoy the silence!😳
youtu.be/81AFdWXLNCU?...
TIL: Dysmorphophobia.
How ugly do you think you are?
(Tip: avoid mirrors or selfies for the next few days...)
en.wikipedia.org/wiki/Body_dy...
The two blue and the red particles have opposite charges. Starting from the vertices of an equilateral triangle they move under Coulomb forces: blue-blue repulsion, red-blue attraction…
The resulting motion is beautifully unpredictable.
More on youtu.be/nqAcMm2o-kk
New paper: "Large Language Models and Emergence: A Complex Systems Perspective" (D. Krakauer, J. Krakauer, M. Mitchell).
We look at claims of "emergent capabilities" & "emergent intelligence" in LLMs from the perspective of what emergence means in complexity science.
arxiv.org/pdf/2506.11135
UNA VITA ESEMPLARE
Non fumava, non beveva... morì-gerato
#μstorie #unafraseunrigoappena #GianfrancoUber #sfera314
Two apparently bored little putti in a painting by Raffaello (Sistine Madonna)
Today I noticed two new students sitting at the back of the classroom.
They didn’t seem very much captivated by my linear algebra lesson… (but… who knows?)
en.wikipedia.org/wiki/Sistine...
#raffaello #boredlittleangels
Cena a lume di candela.
Lei, tremante e trepidante: - E... se m'amassi?
Lui, rassicurante, guardandosi attorno un po' distratto: - Ma no che non t'amasso!
#μstorie #unafraseunrigoappena #CleudioTullii #sfera314
from the book "On the Papatopo and the End of Times" The last Pope was foretold by a bird vomiting mice. Calamities followed: fires, earthquakes, floods, droughts, and the Intolerable Burning of the Earth. Then, after the groans of many and moonless nights, the Papatopo appeared, savior of the human race.
ex libro "De Papatopo et Fine Temporum"
Ultimus Papa praenuntiatus est per avem mures evomentem.
Calamitates secutae sunt: incendia, terrae motus, diluvia, siccitates, atque Intolerabilis Terrae Ardor.
Tunc, post gemitus multorum et noctes sine luna, apparuit Papatopus, salvator generis humani.
Consider an equilateral triangle and place three equal masses at the 3 vertices.
Are there points in the plane in which the net gravitational field is zero? (equilibrium pts or sort of Lagrangian pts)
The centroid? Yes! But there are 3 other equilibrium points! 😳
Cardinali, ♝ attenti!
Se una vostra "affrettata" ricerca su Google ha generato questo risultato, sappiate che non è di questo prodotto che andrete a discutere tra qualche giorno...
(🔺 @iddio.bsky.social
per favore mandagli istruzioni chiare e semplici. In fondo... so' ragazzi.... )
#Pontifex
During a gravitational elliptic orbit, the path traced by tip of the velocity vectors (collected together as to have a common origin) is a circle!!! 😲
In general, the curve traced by the tip of the velocity vector of a moving body is called "Hodograph".
archive.org/details/1207...
