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10 schools of philosophy and why you should know them
There are many famous schools of thought that you have probably heard of, but did you hear the truth or just get a caricature of the idea?
For your reading pleasure, here are ten schools of philosophy you should know about. Some of them are commonly misunderstood, and we correct that problem here.
The leading philosophy among angsty teens who misunderstand Nietzsche.
The root of the word 'nihilism' is derived from the Latin nihil, meaning "nothing", and it is a more of a series of related positions and problems than a single school of thought. The key idea of it is the lack of belief in meaning or substance in an area of philosophy. For example, moral nihilism argues that moral facts cannot exist; metaphysical nihilism argues that we cannot have metaphysical facts; existential nihilism is the idea that life cannot have meaning and nothing has value—this is the kind that most people think of when they hear the word.
As opposed to popular understanding, Nietzsche was not a nihilist. Rather, he wrote about the dangers posed by nihilism and offered solutions to them. Real nihilists included the Russian nihilist movement.
The leading philosophy among angsty undergraduates who understand Nietzsche.
Existentialism is a school of thought originating in the work of Soren Kierkegaard and Nietzsche. Existentialism focuses on the problems posed by existential nihilism. What is the point of living if life has no inherent purpose, where can we find value after the death of God, and how do we face the knowledge of our inevitable demise? Existentialists also ask questions about free will, choice, and the difficulties of being an individual.
The existentialists also included Jean-Paul Sartre, Simone de Beauvoir, and Martin Heidegger. Albert Camus was associated with the movement, but considered himself independent of it.
A philosophy popular in ancient Greece and Rome, and practiced today by many people in high-stress environments.
Stoicism is a school that focuses on how to live in a world where things don’t go your way. Is it raining when you just waxed your car? Accept it. Does the lady at the desk next to you sound like a dying cat when she speaks? Accept it, and move on to the next problem. The idea at the heart of it is acceptance of all things that are beyond your control. Pain will pass, you will remain, so the best thing to do is focus on what you can control.
Famed stoics included Zeno of Citium, Seneca, and Marcus Aurelius. Today many athletes rely on stoicism to help them focus on their performance during games, rather than how the other team is doing.
Hedonism is the idea that pleasure or happiness is the one thing with intrinsic value. This idea has been held by many other schools across history, most famously the utilitarians. While happiness is often construed as pleasure and the green light is often given to depravity by this school, Greek thinker Epicurus was also a hedonist and tied it to a virtue ethics system based around moderation. He argued that moderation lead to the most happiness for the individual in the long run.
The word “hedonistic”, when used as a slur, relates to this school only in that many hedonistic thinkers also saw pleasure as the key to a good life. Many hedonistic philosophers viewed pleasure as a kind of happiness, but few held it as the “only” happiness. Most hedonistic philosophers would say you should read a book rather than get drunk, as reading is a higher kind of happiness than getting snockered.
Famous hedonists include Jeremy Bentham, Epicurus, and Michel Onfray. Hedonism is also the oldest philosophy recorded, making an appearance in The Epic of Gilgamesh.
Marxism is a school based on the collected ideas of Karl Marx, the 19th century German philosopher, and the related ideas others have added after his death. His key ideas are all critiques of capitalism, such as the idea that the capitalist mode of production alienates us from the results of our labor, the tendency of capitalism to overproduce and crash as a result, and the labor theory of value. He also proposed a few ideas to help fix the problems he found in capitalism, many of them less radical than you might suppose.
Cultural Marxism is a thing, but not what your crazy uncle says it is. In reality, it is a method of critiquing a consumerist society for reducing everything to a commodity and the phenomena of mass marking reaching into all parts of our lives which was proposed by German philosophers who didn’t like the Soviet system either. I am sure the comments section will disagree with this fact passionately.
Famed Marxists include Lenin, Stalin, Mao, and Slavoj Zizek; though all of the listed individuals have been called heretics at one point or another by other Marxists. Ironically, Marx himself claimed to not be one.
Have you ever wondered if we can base absolutely everything on logic and empirical evidence?
The logical positivists had a good try—until they found it a dead end. This school was popular in the 1920s and '30s, and was focused on the idea of verifications, which sought to base all knowledge on either empirical data or logical tautologies. By this idea, metaphysics, ethics, theology, and aesthetics cannot be studied philosophically as they don’t offer ideas with truth values. As it turns out the core tenet of verificationism cannot be shown to be true either, posing an unsolvable problem for the school.
The school was largely unsuccessful in its work, and suffered a major blow when Ludwig Wittgenstein denounced his previous work in favor of the school’s ideas then utterly changed course. The school still had a great deal of influence, particularly on the work of Karl Popper and Wittgenstein, who worked so hard to disprove the core tenets.
Famed members of the movement included Bertrand Russell, Ludwig Wittgenstein, and the Vienna Circle. All of them were brilliant, and after the decline of the school most of them went on to other projects.
Taoism is a school of thought based around the Tao Te Ching, written by the ancient Chinese philosopher Lao-Tzu as he left China to live as a hermit. Taoism is based around ideas of humility, the 'Way', a focus on the individual, simplicity, and naturalness. It is commonly practiced as a folk religion by the Chinese, and Taoists often make offerings to various gods.
Taoist thought would later fuse with Buddhism and birth of Zen. Elements of it would also be incorporated into the concept of Neo-Confucianism. The principles of Taoism would also resonate with physicist Niels Bohr who admired Taoism’s ability to view opposites as complementary.
If our senses are often wrong, how can we ever trust them to get reality right? This is the key tenet of rationalism, the idea that knowledge must come primarily from reason and thought, rather than empirical evidence.
The idea has been widespread in history. Thinkers who argued for rationalism included Socrates, Rene Descartes, and Spinoza. Their view, that reason alone could reveal the great truths of the world, has largely fallen out of use in favor of a more diverse group of methods for finding truth. British philosopher Galen Strawson explained the limit of rationalist approaches to knowledge when he explained, "you can see that it is true just lying on your couch. You don't have to get up off your couch and go outside and examine the way things are in the physical world. You don't have to do any science." Convenient, but no longer enough. Today, most thinkers combine rationalist notions with empirical data.
Relativism is the idea that views are relative to perspective or considerations. This idea can even be applied to morality or truth itself, with some arguing then that there are no moral facts or absolute truths. Similarly, situational relativism is an idea in ethics where a rule is to be followed under all conditions except for some, when we would then follow another rule. For example, don’t kill unless you would save lives by doing so. This idea, in a revised form, was supported by American philosopher Robert Nozick in his book Anarchy, State, and Utopia.
Most of you are probably familiar with the idea of “cultural relativism” which is the notion that the morality of two differing cultures cannot be compared and a person outside of one culture cannot critique the values and morality of another. This idea is not held by any major philosophers, and is generally seen as self-defeating by those who work in ethics.
A religion based around the teachings of Gautama Buddha, an Indian prince, Buddhism is dedicated to the idea that suffering has a cause and that we can overcome it by means of mediation, following the noble eightfold path, and contemplation of sutras.
The many schools of Buddhism are rather diverse in their thought, bound together primarily by the Buddha’s ideas on suffering. Some are non-theistic while others have a pantheon of gods and demons. Some hold that karma exists and reincarnation is a part of life while others reject any discussion of an afterlife. Most are peaceful while others… not so much. In the west, Buddhist ideas on meditation are often widely shared while other elements of the religion are ignored.
Certain water beetles can escape from frogs after being consumed.
- A Japanese scientist shows that some beetles can wiggle out of frog's butts after being eaten whole.
- The research suggests the beetle can get out in as little as 7 minutes.
- Most of the beetles swallowed in the experiment survived with no complications after being excreted.
In what is perhaps one of the weirdest experiments ever that comes from the category of "why did anyone need to know this?" scientists have proven that the Regimbartia attenuata beetle can climb out of a frog's butt after being eaten.
The research was carried out by Kobe University ecologist Shinji Sugiura. His team found that the majority of beetles swallowed by black-spotted pond frogs (Pelophylax nigromaculatus) used in their experiment managed to escape about 6 hours after and were perfectly fine.
"Here, I report active escape of the aquatic beetle R. attenuata from the vents of five frog species via the digestive tract," writes Sugiura in a new paper, adding "although adult beetles were easily eaten by frogs, 90 percent of swallowed beetles were excreted within six hours after being eaten and, surprisingly, were still alive."
One bug even got out in as little as 7 minutes.
Sugiura also tried putting wax on the legs of some of the beetles, preventing them from moving. These ones were not able to make it out alive, taking from 38 to 150 hours to be digested.
Naturally, as anyone would upon encountering such a story, you're wondering where's the video. Thankfully, the scientists recorded the proceedings:
The Regimbartia attenuata beetle can be found in the tropics, especially as pests in fish hatcheries. It's not the only kind of creature that can survive being swallowed. A recent study showed that snake eels are able to burrow out of the stomachs of fish using their sharp tails, only to become stuck, die, and be mummified in the gut cavity. Scientists are calling the beetle's ability the first documented "active prey escape." Usually, such travelers through the digestive tract have particular adaptations that make it possible for them to withstand extreme pH and lack of oxygen. The researchers think the beetle's trick is in inducing the frog to open a so-called "vent" controlled by the sphincter muscle.
"Individuals were always excreted head first from the frog vent, suggesting that R. attenuata stimulates the hind gut, urging the frog to defecate," explains Sugiura.
For more information, check out the study published in Current Biology.
Are "humanized" pigs the future of medical research?
The U.S. Food and Drug Administration requires all new medicines to be tested in animals before use in people. Pigs make better medical research subjects than mice, because they are closer to humans in size, physiology and genetic makeup.
In recent years, our team at Iowa State University has found a way to make pigs an even closer stand-in for humans. We have successfully transferred components of the human immune system into pigs that lack a functional immune system. This breakthrough has the potential to accelerate medical research in many areas, including virus and vaccine research, as well as cancer and stem cell therapeutics.
Existing biomedical models
Severe Combined Immunodeficiency, or SCID, is a genetic condition that causes impaired development of the immune system. People can develop SCID, as dramatized in the 1976 movie “The Boy in the Plastic Bubble." Other animals can develop SCID, too, including mice.
Researchers in the 1980s recognized that SCID mice could be implanted with human immune cells for further study. Such mice are called “humanized" mice and have been optimized over the past 30 years to study many questions relevant to human health.
Mice are the most commonly used animal in biomedical research, but results from mice often do not translate well to human responses, thanks to differences in metabolism, size and divergent cell functions compared with people.
Nonhuman primates are also used for medical research and are certainly closer stand-ins for humans. But using them for this purpose raises numerous ethical considerations. With these concerns in mind, the National Institutes of Health retired most of its chimpanzees from biomedical research in 2013.
Alternative animal models are in demand.
Swine are a viable option for medical research because of their similarities to humans. And with their widespread commercial use, pigs are met with fewer ethical dilemmas than primates. Upwards of 100 million hogs are slaughtered each year for food in the U.S.
In 2012, groups at Iowa State University and Kansas State University, including Jack Dekkers, an expert in animal breeding and genetics, and Raymond Rowland, a specialist in animal diseases, serendipitously discovered a naturally occurring genetic mutation in pigs that caused SCID. We wondered if we could develop these pigs to create a new biomedical model.
Our group has worked for nearly a decade developing and optimizing SCID pigs for applications in biomedical research. In 2018, we achieved a twofold milestone when working with animal physiologist Jason Ross and his lab. Together we developed a more immunocompromised pig than the original SCID pig – and successfully humanized it, by transferring cultured human immune stem cells into the livers of developing piglets.
During early fetal development, immune cells develop within the liver, providing an opportunity to introduce human cells. We inject human immune stem cells into fetal pig livers using ultrasound imaging as a guide. As the pig fetus develops, the injected human immune stem cells begin to differentiate – or change into other kinds of cells – and spread through the pig's body. Once SCID piglets are born, we can detect human immune cells in their blood, liver, spleen and thymus gland. This humanization is what makes them so valuable for testing new medical treatments.
We have found that human ovarian tumors survive and grow in SCID pigs, giving us an opportunity to study ovarian cancer in a new way. Similarly, because human skin survives on SCID pigs, scientists may be able to develop new treatments for skin burns. Other research possibilities are numerous.
The ultraclean SCID pig biocontainment facility in Ames, Iowa. Adeline Boettcher, CC BY-SA
Pigs in a bubble
Since our pigs lack essential components of their immune system, they are extremely susceptible to infection and require special housing to help reduce exposure to pathogens.
SCID pigs are raised in bubble biocontainment facilities. Positive pressure rooms, which maintain a higher air pressure than the surrounding environment to keep pathogens out, are coupled with highly filtered air and water. All personnel are required to wear full personal protective equipment. We typically have anywhere from two to 15 SCID pigs and breeding animals at a given time. (Our breeding animals do not have SCID, but they are genetic carriers of the mutation, so their offspring may have SCID.)
As with any animal research, ethical considerations are always front and center. All our protocols are approved by Iowa State University's Institutional Animal Care and Use Committee and are in accordance with The National Institutes of Health's Guide for the Care and Use of Laboratory Animals.
Every day, twice a day, our pigs are checked by expert caretakers who monitor their health status and provide engagement. We have veterinarians on call. If any pigs fall ill, and drug or antibiotic intervention does not improve their condition, the animals are humanely euthanized.
Our goal is to continue optimizing our humanized SCID pigs so they can be more readily available for stem cell therapy testing, as well as research in other areas, including cancer. We hope the development of the SCID pig model will pave the way for advancements in therapeutic testing, with the long-term goal of improving human patient outcomes.
Adeline Boettcher earned her research-based Ph.D. working on the SCID project in 2019.
Satellite imagery can help better predict volcanic eruptions by monitoring changes in surface temperature near volcanoes.
- A recent study used data collected by NASA satellites to conduct a statistical analysis of surface temperatures near volcanoes that erupted from 2002 to 2019.
- The results showed that surface temperatures near volcanoes gradually increased in the months and years prior to eruptions.
- The method was able to detect potential eruptions that were not anticipated by other volcano monitoring methods, such as eruptions in Japan in 2014 and Chile in 2015.
How can modern technology help warn us of impending volcanic eruptions?
One promising answer may lie in satellite imagery. In a recent study published in Nature Geoscience, researchers used infrared data collected by NASA satellites to study the conditions near volcanoes in the months and years before they erupted.
The results revealed a pattern: Prior to eruptions, an unusually large amount of heat had been escaping through soil near volcanoes. This diffusion of subterranean heat — which is a byproduct of "large-scale thermal unrest" — could potentially represent a warning sign of future eruptions.
Conceptual model of large-scale thermal unrestCredit: Girona et al.
For the study, the researchers conducted a statistical analysis of changes in surface temperature near volcanoes, using data collected over 16.5 years by NASA's Terra and Aqua satellites. The results showed that eruptions tended to occur around the time when surface temperatures near the volcanoes peaked.
Eruptions were preceded by "subtle but significant long-term (years), large-scale (tens of square kilometres) increases in their radiant heat flux (up to ~1 °C in median radiant temperature)," the researchers wrote. After eruptions, surface temperatures reliably decreased, though the cool-down period took longer for bigger eruptions.
"Volcanoes can experience thermal unrest for several years before eruption," the researchers wrote. "This thermal unrest is dominated by a large-scale phenomenon operating over extensive areas of volcanic edifices, can be an early indicator of volcanic reactivation, can increase prior to different types of eruption and can be tracked through a statistical analysis of little-processed (that is, radiance or radiant temperature) satellite-based remote sensing data with high temporal resolution."
Temporal variations of target volcanoesCredit: Girona et al.
Although using satellites to monitor thermal unrest wouldn't enable scientists to make hyper-specific eruption predictions (like predicting the exact day), it could significantly improve prediction efforts. Seismologists and volcanologists currently use a range of techniques to forecast eruptions, including monitoring for gas emissions, ground deformation, and changes to nearby water channels, to name a few.
Still, none of these techniques have proven completely reliable, both because of the science and the practical barriers (e.g. funding) standing in the way of large-scale monitoring. In 2014, for example, Japan's Mount Ontake suddenly erupted, killing 63 people. It was the nation's deadliest eruption in nearly a century.
In the study, the researchers found that surface temperatures near Mount Ontake had been increasing in the two years prior to the eruption. To date, no other monitoring method has detected "well-defined" warning signs for the 2014 disaster, the researchers noted.
The researchers hope satellite-based infrared monitoring techniques, combined with existing methods, can improve prediction efforts for volcanic eruptions. Volcanic eruptions have killed about 2,000 people since 2000.
"Our findings can open new horizons to better constrain magma–hydrothermal interaction processes, especially when integrated with other datasets, allowing us to explore the thermal budget of volcanoes and anticipate eruptions that are very difficult to forecast through other geophysical/geochemical methods."