A simple cylinder in a steady flow creates a beautiful wake pattern known as a von Karman vortex street. The image above shows several examples of this pattern. Flow is from bottom to top, and the Reynolds number is increasing from left to right. In the experiment, this increasing Reynolds number corresponds to increasing the flow velocity because the cylinder size, fluid, and temperature were all fixed. As the Reynolds number first increases, the cylinder begins to shed vortices. The vortices alternate the side of the cylinder from which they are shed as well as alternating in their sense of rotation (clockwise or counterclockwise). Further increasing the Reynolds number increases the complexity of the wake, with more and more vortices being shed. The vortex street is a beautiful example of how fluid behavior is similar across a range of scales from the laboratory to our planet’s atmosphere. (Image credit: Z. Trávníček et. al)
Though often used as a synonym of “isolation" (where sick people are kept from well people), quarantine is technically defined as “to separate those suspected of exposure to an illness to see if they become ill” - hence the quarantine laws for livestock and pets when moving between countries, especially countries where rabies or hoof-and-mouth disease isn’t endemic.
These signs were posted on houses and farms that had a patient (and, as such, exposed family or herd members) infected with, from top to bottom, hoof-and-mouth disease, scarlet fever, diphtheria, smallpox, and poliomyelitis.
Total deaths per planet.
“Nickel Tailings #34,” Sudbury, Ontario, Canada, 1996
Tailings are the materials left over after the process of separating the valuable portion from the “unwanted” portion of an ore. The bright orange in the above photo is caused by the oxidation of the iron that has been left behind in the process of separating nickel and other metals from the ore. These leftover materials are not usually part of the ecology into which they are dumped or do not naturally occur in tailing concentrations. Mining endeavors typically confine tailing in retention ponds or remove the water and “dry stack” the waste material.
Current fracking waste-waters have been been under scrutiny due to incidences of radioactive contamination that is not being addressed.
More images by Edward Burtynsk
[There is a] general principle of internet language these days that the more overwhelmed with emotions you are, the less sensical your sentence structure gets, which I’ve described elsewhere as “stylized verbal incoherence mirroring emotional incoherence” and which leads us to expressions like “feels,” “I can’t even/I’ve lost the ability to can,” and “because reasons.”
Contrast this with first-generation internet language, demonstrated by LOLcat or 1337speak, and in general characterized by abbreviations containing numbers and single letters, often in caps (C U L8R), smilies containing noses, and words containing deliberate misspellings.
We’ve now moved on: broadly speaking, second-generation internet language plays with grammar instead of spelling. If you’re a doomsayer, the innovative syntax is one more thing to throw up your hands about, but compared to a decade or two ago, the spelling has gotten shockingly conventional.
In this sense, doge really is the next generation of LOLcat, in terms of a pet-based snapshot of a certain era in internet language. We’ve kept the idea that animals speak like an exaggerated version of an internet-savvy human, but as our definitions of what it means to be a human on the internet have changed, so too have the voices that we give our animals. Wow."
Voronoi’s Division of Poland
Source: szyy (reddit)
Voronoi Diagram is a pretty sophisticated mathematical idea so I won’t explain it in a scientific way. Nevertheless, in cartography is it simpler to understand. This map shows how would Poland look like if it were to be partitioned based on distance to the regions’ capitals. Voronoi Diagram borders are black lines and regional capitals are black dots.
Simply speaking, each point on this map is closer (or at least equally distant) to their region’s capital than to any other capital.
As you can see, I’ve also put current regional borders in Poland and some of them pretty much correspond to the Voronoi ones.