Reposted by Ahmad
This morning frost on a plastic manhole cover reveals the embedded metal grid that strengthens it.
December 31, 2025 at 12:20 PM
This morning frost on a plastic manhole cover reveals the embedded metal grid that strengthens it.
Reposted by Ahmad
I went the the Natural History Museum (London) In June 2019 to see Luke Jerram's splendid Museum of the Moon. Although the surface of the sphere was smooth, the shading fooled one's eye into interpreting it as embossed. My tactile acuity with Braille map didn't my match visual acuity!
January 14, 2026 at 4:21 PM
I went the the Natural History Museum (London) In June 2019 to see Luke Jerram's splendid Museum of the Moon. Although the surface of the sphere was smooth, the shading fooled one's eye into interpreting it as embossed. My tactile acuity with Braille map didn't my match visual acuity!
Reposted by Ahmad
Died OTD, French physicist, Felix Billet, published in 1868 results of an experiment in which he illuminated a thin, vertical stream of water with sunlight and managed to see 19 rainbow orders including supernumeraries. He named it “la rose des arc-en-ciel”, known in English as Billet’s Rose.
January 28, 2026 at 10:27 AM
Died OTD, French physicist, Felix Billet, published in 1868 results of an experiment in which he illuminated a thin, vertical stream of water with sunlight and managed to see 19 rainbow orders including supernumeraries. He named it “la rose des arc-en-ciel”, known in English as Billet’s Rose.
Reposted by Ahmad
E.Chladni b OTD 1756, known for the patterns formed on a glass plate sprinkled with fine sand & exited with a bow, was also the first person to measure the speed of sound in gases other than air by comparing the pitch of an organ pipe filled with a gas with that filled with air.
November 30, 2025 at 12:49 PM
E.Chladni b OTD 1756, known for the patterns formed on a glass plate sprinkled with fine sand & exited with a bow, was also the first person to measure the speed of sound in gases other than air by comparing the pitch of an organ pipe filled with a gas with that filled with air.
Reposted by Ahmad
L. Galvani d OTD, became interested in animal electricity when a student dissected a frog’s leg while another operated a static electricity generator, noticed that when it sparked the frog’s leg contracted involuntarily. Is it possible to claim a frog, martyr to science, had picked up a radio wave?
December 4, 2025 at 3:14 PM
L. Galvani d OTD, became interested in animal electricity when a student dissected a frog’s leg while another operated a static electricity generator, noticed that when it sparked the frog’s leg contracted involuntarily. Is it possible to claim a frog, martyr to science, had picked up a radio wave?
Reposted by Ahmad
The first systematic measurements of the speed of sound in water were made in Lake Geneva in November 1826, by Daniel Colladon a Swiss physicist, with the help of his father, some two centuries after the earliest measurements of the speed of sound in air.
December 13, 2025 at 12:43 PM
The first systematic measurements of the speed of sound in water were made in Lake Geneva in November 1826, by Daniel Colladon a Swiss physicist, with the help of his father, some two centuries after the earliest measurements of the speed of sound in air.
Reposted by Ahmad
A whispering wall behind Tate Modern; just across the river from the most famous, though by no means the only, whispering gallery in the world at the base of the dome of St.Paul’s. Had the wall been made taller and a shelf added on which one could sit, the Tate would have another "installation"
May 23, 2025 at 10:20 AM
A whispering wall behind Tate Modern; just across the river from the most famous, though by no means the only, whispering gallery in the world at the base of the dome of St.Paul’s. Had the wall been made taller and a shelf added on which one could sit, the Tate would have another "installation"
Reposted by Ahmad
Near-infrared image of Jupiter taken by the James Webb Space Telescope. In it you can see Jupiter’s auroras and rings as well as two of its moons, Amalthea and Adrastea.
(NASA, ESA, CSA, Jupiter ERS Team; image processing by Ricardo Hueso and Judy Schmidt)
#space #astrophysics #science
(NASA, ESA, CSA, Jupiter ERS Team; image processing by Ricardo Hueso and Judy Schmidt)
#space #astrophysics #science
May 20, 2025 at 3:38 AM
Near-infrared image of Jupiter taken by the James Webb Space Telescope. In it you can see Jupiter’s auroras and rings as well as two of its moons, Amalthea and Adrastea.
(NASA, ESA, CSA, Jupiter ERS Team; image processing by Ricardo Hueso and Judy Schmidt)
#space #astrophysics #science
(NASA, ESA, CSA, Jupiter ERS Team; image processing by Ricardo Hueso and Judy Schmidt)
#space #astrophysics #science
