¡No me pierdas los papeles...!

"...sabía bastante de literatura y de teatro, y cuando alguien sabe de esas cosas cuesta mucho trabajo llegar a averiguar si realmente es estúpido." —Holden Caulfield.

[fuckyeahfluiddynamics]

Not all vortex rings are created equal. Despite identical generation mechanisms and Reynolds numbers, the two vortex rings shown above behave very differently. The donut-shaped one, on the top left in green and in the middle row in blue, was formed in a Newtonian fluid, where viscous stress is linearly proportional to deformation. As one would expect, the vortex travels downward and diffuses some as time passes. The mushroom-like vortex ring, on the other hand, is in a viscoelastic fluid, which reacts nonlinearly to deformation. This vortex ring first furls and expands as it travels downward, then stops, contracts, and travels backward! (Image credit: J. Albagnac et al.; via Gallery of Fluid Motion)

[fuckyeahfluiddynamics]

Typically, shock waves are invisible to the human eye. Using sensitive optical techniques like schlieren photography, researchers in a lab can visualize sharp density gradients like shock waves or even the slight density variations caused by natural convection. But it takes some special conditions to make shock waves visible to the naked eye. The blast wave of the explosion in the photo above is a great example. The leading edge of the shock wave and the heat of the explosion create a strong, sharp change in density. That density change is accompanied by a change in the air’s refractive index. As light travels from the distance toward the camera, it’s distorted–more specifically, refracted–when it travels through the blast wave and its wake. And, in this case, that visual distortion is strong enough that we can clearly see the outlines of the shock waves moving out from the explosion. The apparent horizontal line through the blast wave is probably the intersection of a weaker secondary shock wave with the initial expanding shock wave. (Image credit: Defense Research and Development Canada; via io9)

[deimofobia]

The Hidden Chamber

Do not fear the ghosts in this house, they are the least of your worries. Personally I find the noises they make reassuring, The creaks and footsteps in the night, their little tricks of hiding things, or moving them, I find endearing, not upsetting. It makes the place feel so much more like home. Inhabited. Apart from ghosts nothing lives here for long. No cats, no mice, no flies, no dreams, no bats. Two days ago I saw a butterfly a monarch, I believe, which danced from room to room And perched on walls and waited near to me There are no flowers in this empty place And, scared the butterfly would starve, I forced a window wide, cupped my two hands around her fluttering self, feeling her wings kiss my palms so gentle, and put her out, and watched her fly away. I’ve little patience with the seasons here, but your arrival eased this winter’s chill. Please, wander around. Explore it all you wish. I’ve broken with tradition on some points. If there is one locked room here, you’ll never know. You’ll not find in the cellar’s fireplace old bones or hair. You’ll find no blood. Regard: Just tools, a washing machine, a dryer, a water heater and a chain of keys. Nothing that can alarm you. Nothing dark. I may be grim, perhaps, but only just as grim As any man who suffered such sad affairs. Misfortune, carelessness or pain, what matters is the loss. You’ll see the heartbreak linger in my eyes, and dream of making me forget what came before you walked into the hallway of this house. Bringing a little summer in your glance, and with your smile. While you are here, of course, you will hear the ghosts, always a room away. And you may wake beside me in the night, knowing that there’s a space without a door knowing there’s a place that’s locked but isn’t there. Hearing them scuffle, echo, thump and pound. If you are wise you’ll run into the night fluttering away into the cold wearing perhaps the laciest of shifts. The lane’s hard flints will cut your feet all bloody as you run so, if I wished, I could follow you tasting the blood and oceans of your tears. I’ll wait instead, here in my private place, and soon I’ll put a candle in the window, love, to light your way back home. The world flutters like insects. I think this is how I shall remember you, my head between the white swell of your breasts, listening to the chambers of your heart.

-Neil Gaiman

[little-dose-of-inspiration]

Shaking hands with Death by sandara

[myedol]

[memewhore]

[fuckyeahfluiddynamics]

If you’ve ever blown across the top of a bottle to make it play a note, then you’ve created a Helmholtz resonator. Air flow across the top of the bottle causes air in and around the bottle neck to vibrate up and down. Like a mass on a spring, the air oscillates with a particular frequency that depends on the system’s characteristics. We hear this vibration as a a deep hum, but in the high-speed video above, you’re actually seeing the vibration as smoke pulsing in and out of the bottle. Helmholtz resonance shows up more than just in blowing across beer bottles; it’s also a factor in many resonating instruments, like the guitar. To learn more about the physics and mathematics of the effect, check out this page from the University of New South Wales. (Video credit: N. Moore)

[sandandglass]

[goldbarnone]

I think I saw his standup a little while back.

[deimofobia]

original: https://www.youtube.com/watch?v=cK3vi4tC100

[deimofobia]

Fun #science #SpaceVine – drops are rejected by water bubble if force < surface tension, added if >

[spaceplasma]

Mars, the only known planet inhabited solely by robots.

[fuckyeahfluiddynamics]

Here is a high-speed look at the impact of a raindrop on a sandy beach. In this case, a water droplet is falling on a bed of uniform glass beads, but the situation is effectively the same. Depending on the speed of the drop at impact, many types of craters are possible. The higher the impact velocity, the greater the momentum of the drop at impact and the more likely the drop is to tear apart when surface tension can no longer hold it together. Interestingly, there is remarkable similarity between the shape and behavior of these liquid drop impacts and those of a catastrophic asteroid impact. (Video credit: R. Zhao et al.)

[ted]

THIS IS SO COOL.

[yunzi]

My dear friend is protesting in Mexico City and has told me to let people know of this. He relayed this message to me “We are coordinating the info with all the cities that are protesting today because there’s literally zero coverage in the news, if something happens, people will be left on their own.”

Please help spread the word.

[fyeahmeddy]

They are being put there by the police/army itself to attack themselves and make it look like the students are provoking the police

[science-junkie]

Computer model provides a new portrait of carbon dioxide By Patrick Lynch

An ultra-high-resolution NASA computer model has given scientists a stunning new look at how carbon dioxide in the atmosphere travels around the globe.

Plumes of carbon dioxide in the simulation swirl and shift as winds disperse the greenhouse gas away from its sources. The simulation also illustrates differences in carbon dioxide levels in the northern and southern hemispheres and distinct swings in global carbon dioxide concentrations as the growth cycle of plants and trees changes with the seasons.

NASA’s Goddard Space Flight Center

[ted]

This is gorgeous… and strangely soothing.

For more mesmerizing climate models, watch Gavin Schmidt’s talk about climate change patterns»

[educational-gifs]

Evolution from bacteria to human.

You might also like: “The evolution of the turtle shell.”

[deimofobia]

"El problema de mucha gente que solo lee ficción literaria es que dan por hecho que la fantasía consiste únicamente en libros sobre orcos, trasgos, dragones, magos y gilipolleces. Y reconozcámoslo, mucha fantasía es así. El problema de los aficionados a la fantasía es que creen que la ficción literaria consiste solo en historias sobre un tío que bebe té mientras mira llover por la ventana y piensa en su madre. Y lo cierto es que mucha ficción literaria es justo eso, gilipolleces masturbatorias emo y angustiosas sin demasiado sentido.

Sin embargo, no se nos debería juzgar por nuestros mínimos denominadores comunes. Y no deberíamos caer en la lógica falaz de que la ficción literaria es literaria y todos los demás géneros son género. La ficción literaria es un género, y lucharé a muerte contra cualquiera que niegue una verdad tan evidente.

Entonces, ¿hay mucha fantasía por ahí que es mierda pura y dura? Sin duda. Lectura palomitera, como mucho. Pero no se puede negar que buena parte de la ficción literaria también es una mierda. El 85% de todo en este mundo es mierda. Juzgamos las cosas por lo mejor que ofrecen de sí mismas, y ahí fuera hay fantasía excelente de verdad. Por ejemplo, El sueño de una noche de verano, o Hamlet, que tiene un fantasma, o Macbeth, con fantasma y brujas; a mí me gustan también la Odisea, casi todo el Pentateuco del Viejo Testamento yGargantúa y Pantagruel.

Lo cierto es que la fantasía existía antes que la ficción literaria y, si niegas esas raíces, te estás podando tan al cero que sin duda acabarás marchito y muerto."

http://www.fantifica.com/fandom/noticias/patrick-rothfuss-epica-respuesta-ninguneo-fantasia

[ted]

Even monkeys hate unequal pay. In this hilarious video, Frans de Waal shows what happens when you give two monkeys the same task but different rewards. The monkey that gets a measly cucumber instead of a sweet grape sees the unfairness… and she gets pretty ticked off. 

Learn more about moral behavior in animals »

[sizvideos]

Video