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How Copper Smelters Accidentally Sparked the Birth of the Iron Age https://scitechdaily.com/how-copper-smelters-accidentally-sparked-the-birth-of-the-iron-age/ #science

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    @http_error_418 @adeelahmed @dantheclamman is wonderful!
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    Quantum Rayleigh-Taylor InstabilityThe Rayleigh-Taylor instability–typically marked by mushroom-shaped plumes–occurs when a dense fluid accelerates into a less dense one. But researchers have now demonstrated the effect at quantum scales, too.For their experiment, the group used a Bose-Einstein condensate of sodium atoms and made the interface between them by exciting half of the atoms into a spin-up state and half into a spin-down one. With the interface is place, they reversed the magnetic field gradient, inducing a force on the atoms equivalent to the buoyant force seen in conventional Rayleigh-Taylor instabilities. As shown above, the interface first warped, then developed Rayleigh-Taylor mushrooms and eventually became turbulent. (Image and research credit: Y. Geng et al.; via Physics World)#fluidDynamics #instability #physics #quantumMechanics #RayleighTaylorInstability #science #turbulence
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    les jeux (de couleurs) sont faitsYohei Kisanuki, Limbatrip, Spin Art with WhiteBoard and Potter’s WheelLe phénakistiscope (mot formé du grec phenaxakos, « trompeur », et skopein, « examiner ») est un jouet optique donnant l'illusion du mouvement attribué à la persistance rétinienne. Il a été inventé par le Belge Joseph Plateau en 1832#animation #art #science #color #painting
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    @JubalBarca Two egregious things about Academia.edu:1) their new TOS are "irrevocable" and "transferable", and explicitly include the use of your name, likeness, photo and voice "for any purpose." They could literally make you the new spokesperson for neo-nazis, or chicken mcnuggets, under those terms.2) someone here says that Academia.edu has already sent out emails purporting to be from them, urging folks to join academia.edu or whatever. One went to a leading figure in the person's field.@histodons #academia