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Because MySQL is proven technology that works just fine for them.There's a lot of confusion and hype over SQL vs NoSQL but these are just marketing terms and don't really describe the different types of databases available. Here's a short list:RelationalKey-ValueDocument StoreGraphColumnarThe relational variants (MySQL, PostgreSQL, SQL Server, Oracle, etc) are commonly referred to as SQL databases because they implement SQL (structured query language) as the interface to access data.A lot of data is inherently relational so these databases make it easy to manage naturally. They've also been around for decades and provide lots of documentation, great performance, community support, experienced developers and versatility to handle a wide range of applications (you can design for just about any kind of situation).The relational model has schemas, data types, normalization and ACID guarantees to protect your data and you can use SQL to run computations directly in the database. For 95% of sites out there, scaling isn't an issue and you can do just fine with scale-up (bigger machines) or scale-out (replicas) strategies that have been used for years. There's a lot of comfort in knowing your problem has already been solved.NoSQL databases (a name for all the other types listed above) are really only used when their unique storage system is needed for a particular challenge. They're still fairly young technologies so they have plenty of bugs and issues and not as big of a community. They are not magical technology that just solves every data problem out there.Pinterest probably makes use of the stability and history of MySQL instead of trying out new technologies that might not work. After all, even Facebook still keeps the majority of its data in MySQL to this day.More info:What is the relation between NoSQL, the CAP theorem and ACID?What is SQL?

Batman has a side to him that’s not often mentioned in comics. The one where the supervillians do something so evil, that Batman can’t help but turn to being disturbingly creative in how he addresses them.Enter Ras Al-Ghul. Ras Al-Ghul is obsessed with two things: “restoring the balance” to the natural world by reducing the effect humanity has on it (with his methods involving a combination of lawful, and unlawful means to do so, including literal doomsday devices he builds while quite literally funding environmental advocacy groups) and his own immortality, and actively uses a thing called a lazarus pit to remain that way. It’s an extremely rare, naturally occuring hole in the ground, usually found deep underground, where a unique combination of chemicals have blended that can pretty much restore anything organic to life or at least, repair it significantly.He’s also an extremely skilled combatant with just about every method of combat man can devised, a master strategist, and one of Batman’s ironically enough, more mentally stable villians, who can sometimes be negotiated with, convinced not to do evil shit via argument, ect. He also has a lot of respect for Batman, and wants him as his heir whenever the Lazarus pits stop halting his aging or bringing him back to life.Well, one day Ras Al-Ghul makes the biggest mistake of his life. He realizes Batman will never join him, and has a rare, completely out of character tantrum where he kills several innocent people as well as badly injures several of Batman’s allies. It’s also about the same time that Batman finds out Ras Al-Ghul descrated his parent’s graves.Batman’s response *starts* with blowing Ras al Ghul up with a bomb hidden in Ras’ own lair, only for Ras’ followers to learn that Batman finally figured ouut what makes the Lazarus pits work and also how to break them. Every one of them he can find, Batman irrevocably contaminates with an acid which breaks down the trace organic compounds necessary for the lazarus pits to work. The next time Ras Al Ghul takes a dip, he comes out with most of his skin gone, in extreme pain, and forced to seek out a new lazarrus pit if he’s going to continue surviving at all.One by one, Batman contaminates all of them in the same fashion. Literally forcing Ras al Ghul to keep looking for help as his body literally slowly rots away while he’s still alive, and growing increasingly weaker.Finally, in desperation, Ras attacks a city named Nandu Parbet, location of the last known lazarus pit. Unknown to Ras, this “lazarus pit”, is actually the fountain of youth, and it will work only on an innocent man.Ras Al-Ghul dies literally, because Batman made it impossible for him to ever resurrect himself. Later Ras Al-Ghul would find a work around of literrally posessing his firstborn son’s own body, but…Batman didn’t kill Ras Al-Ghul. But he forced him into an ultimately futile desperate searrch for a means to save himself that was all for nothing. Which isn’t much of a distinction.

I can think of about seven legit examples.All of the following were caused by chance mutations in human DNA (fun fact: every human has about 50–100 of these) and granted these people seemingly super-human abilities, including enhanced senses, superhuman durability & reflexes, and more.Certainly nothing over-the-top like this, but definitely above what the average Joe could accomplish.Enhanced Color DetectionConcetta Antico, an artist, is capable of detecting nine times more colors than the average person can. She has a unique mutation called a “tetrachromat,” in which mutations on both her X chromosomes led to extra cones in her eyes, giving her enhanced vision, and even cooler, enhanced color detection.She reportedly can see and distinguish about nine million different colors, most of which are “invisible colors,” meaning that almost no other humans can perceive them. She reportedly views everyday objects such as rocks and pebbles as vibrant displays of rainbow-like colors popping out at her, and can see pinks, oranges, yellows, reds, and blues across the surface of a road.Enhanced Stomach LiningThis one’s definitely one of the weirder superpowers. A French comedian named Michel Lotito regularly shocked audiences by consuming all sorts of objects and having no adverse reactions afterward.He has eaten all of the following: 18 bicycles, 15 supermarket trolleys, seven TV sets, six chandeliers, two beds, a pair of skis, a computer, and even a plane. A whole plane.After further research, doctors concluded that the secret to his ability lay in his stomach lining, which was so thick that he was able to digest metal—nine tons of it, in fact, before he died of natural causes.Enhanced MemoryReported to be more of a curse than a superpower.The most well-known example is that of Marilu Henner, who can remember nearly all the events in her life, down to the minutest details.She has a neurological condition called hyperthymesia (AKA highly superior autobiographical memory (HSAM)), which allows her to store memories like pictures on a camera roll—when she visits these memories, she claims it is like rewatching old videos or looking at old pictures. She can even pinpoint which memories occur at what point in her life and recall specific memories from that time.Enhanced Intelligence and Rapid CalculationScott Flansburg, AKA The Human Calculator, is capable of performing mental mathematical functions faster than a calculator.There have been many, many instances of insanely fast calculation performed by this man, but what makes him so unique is how his power came about.A rare, unnamed genetic mutation had combined the area of the brain that does math with the area of the brain that controls movement—the motor cortex. Thus, his brain was hardwired to do math as easily as walking and talking.Enhanced Sense of SmellJoy Milne from Scotland has an extremely unusual ability: she is capable of smelling Parkinson’s Disease and some forms of cancer before diagnosis. In a study conducted by Edinburgh University, she could smell the disease 12/12 times on average. Joy could even detect the disease just by smelling a patient’s clothes.This was a major breakthrough, since it led scientists to conclude that the disease gave off a molecular signature in the form of an odor—one that could be tracked.Before long, a collection of 10 molecules were found, all were unique to Parkinson’s patients. The cause for this ability is still unknown.Weather and Cold ResistanceWim Hof, a Dutch athlete known locally as the Iceman, is capable of surviving in extremely cold temperatures, due to his strange breathing patterns.Hof can consciously control his breathing to speed up his heart rate, raise his adrenaline levels, and increase his nervous system activity. He claims that he has achieved this level of self-control through meditation and the “Wim Hof Method,” which he says that anyone can use to gain a greater degree of self-knowledge.As a result, he’s capable of withstanding extreme cold, and has performed many mind bending feats, like staying in an ice-bath for almost two hours and climbing Mount Everest in his underwear.Superhuman EnduranceIt may sound over dramatized, but this one truly is superhuman.Dean Karnazes, an ultramarathon runner, was born with a quite peculiar trait: his body does not produce lactic acid.Lactic acid causes the burning sensation you feel when you exercise. When it builds up, your muscles undergo fatigue. Karnazes’s body, on the other hand, does not experience this buildup. Thus, he can run inconceivable distances, usually without breaking much of a sweat.Karnazes has achieved numerous mind-boggling feats using his gift, such as:Running 350 miles in 80 hrs and 44 mins without sleepCompleted a 200 mile race from Calistoga to Santa Cruz eleven timesRan a marathon in the South Pole in freezing temperatures without snowshoesRan a 135 mile marathon across Death Valley in 120 degree F (49 C) weatherRan 50 marathons in 50 consecutive days in all 50 statesThese are but a few of his accomplishments. It has been speculated that, should he be supplied with adequate food and water, he could run indefinitely and only be stopped by injury to his feet.Superhuman Bone DensityA man back in 1994, only known as John, was involved in a car crash, and walked away completely unscathed. A subsequent X-ray revealed that his bones were about eight times denser than the average person’s, meaning that John (and his distant relatives, sprinkled across the Eastern Seaboard) was capable of surviving almost all forms of blunt-force trauma, and his bones would not fracture.A mutated region of chromosome 11 turned out to be the cause. John and his relatives all had a mutation called LRP5, which deals with the LDL receptors in the body, and a total of 21 other family members had the condition.Thank you for reading.Sources:The world's densest bonesMeet the woman who can smell Parkinson's diseaseWeird world records: bizarre entries in the Guinness Book of World RecordsThe women with superhuman visionScott Flansburg - Human Calculator - Super Human Number 8 - Real life SuperhumansSuperior Autobiographical Memory & Hyperthymesia RecallScience Explains How the Iceman Resists Extreme ColdDean Karnazes