In popular culture, the term “tin foil hat” is often used metaphorically to refer to someone who is believed to be paranoid or holding irrational beliefs, particularly conspiracy theories. It originated from the idea that wearing a hat made of aluminum foil could protect a person’s brain from mind control or surveillance by blocking electromagnetic fields. Conspiracy theories are rampant, with some being more popular than others. There have been instances where certain conspiracy theories turned out to be true or partially true, leading some individuals to believe that any conspiracy can be true. However, the statistical reality is that only around 5% of conspiracy theories have any basis in truth, making the remaining 95% unfounded. While it is important to keep an open mind and listen to others, scientific conspiracy theories often involve individuals spouting baseless claims, pretending to be experts in fields like chemistry and biology. Despite the wealth of information available online, people tend to seek out sources that confirm their existing beliefs, reinforcing their misguided notions. While some scientific conspiracy theories can be easily debunked, others require a deeper understanding to disprove. This article aims to dismantle common scientific conspiracy theories by providing the necessary evidence to support rational perspectives.

COVID-19 & Literally Every Conspiracy Surrounding It
- Height Of Conspiracy: 2020-Present
There are several scientific conspiracy theories related to the COVID-19 Pandemic. However, one of the most notable is that the pandemic was the result of a global conspiracy involving most of the world’s governments, pharmaceutical companies, and other major organizations. Of course, this theory is not supported by any actual evidence whatsoever. The scientific consensus is quite clear, in that there is a disease known as COVID-19, and that it has killed millions of people. While one can point to the number of deaths caused specifically by COVID as incorrect, the adjusted numbers aren’t much better.


The Satanic Panic
- Height Of Conspiracy: 1980s to 2000s
The Satanic Panic conspiracy began roughly around the early 1980s and would technically be a “thing” for the United States until the 2000s. Sadly, it came back a bit recently thanks to the pot-stirrers from QAnon. It technically began with around 12,000 cases of unproven Satanic Ritual Abuse cases. The panic really began through the Michelle Remembers book written by a Canadian psychiatrist named Lawrence Pazder. It was co-written by his future wife (then patient), Michelle Smith. They used the since-discredited concept of “recovered-memory therapy.” In these sessions, Smith made several crazy claims about massive satanic ritual abuse.


Chemtrails & How They Were Used To Control The Population
- Height Of Conspiracy: Late 1990s to 2020s
We should probably put partial blame on the United States Air Force for this one. As the concept of weather manipulation began to circulate when they published a report in 1996 about it. Following this, it was claimed that the Air Force was spraying Americans with mysterious substances from their aircraft. The claim was that you could tell they were doing it when you saw “chemtrails” in the sky. Which looked like your average contrail pattern. Richard Finkle, William Thomas, and even radio host Art Bell were the biggest and most vocal names involved in this conspiracy.


Zika Virus Is From Modified Mosquitoes
- Height Of Conspiracy: Mid-2010s to Present
Of all the scientific conspiracy theories on this list, this seems like one of the craziest from the start. The concept is that Bill Gates was involved in experimental biotechnology programs, which led to the artificial creation of the Zika Virus. The virus was spread by mosquitoes, which were genetically modified by the Oxford Insect Technologies team, funded by the Bill and Melinda Gates Foundation. The first tests were done in the Cayman Islands in the Fall of 2009, and then the mosquitoes spread, mutated, and led to other mosquitoes carrying it. Why do this? Apparently, Gates is into Malthusianism, or the ideology to reduce the world’s population.


The 5G Towers Conspiracy
- Height Of Conspiracy: 2020 to Present
It’s almost insulting that anyone has to explain that 5G Towers cannot create viruses. However, sometimes scientific conspiracy theories get out of hand. The conspiracy surrounding the 5G Towers began through a blog post written by John Gregory on a website known as Les moutons enragés. This apparently translates to “the rabid sheep,” in case you were wondering. Gregory claimed that the millimeter wave spectrum used by 5G technology and COVID-19 could be related. He even mentioned how 5G Towers were being installed in Wuhan, China before the coronavirus outbreak. It took just a few months, and this conspiracy led to Europeans setting cellphone towers on fire all over the continent. Gregory was just a small part of this.


The Governments Of The World Are Hiding Aliens From Us
- Height Of Conspiracy: 1900s to Present
This might be among the scientific conspiracy theories that have persisted the longest. People assume we housed all the aliens at Area 51, and to be fair, the United States Government has been terrible at how they handled this. Area 51 is actually an Air Force base where they have tested out new weapons and aircraft for decades. We knew the base existed for years but the government did not acknowledge it for a long time. They finally did acknowledge its existence, but this is likely due to moving some of its testing facilities all over the country to avoid issues. However, the base is still very secretive about its projects and it is one of the most well-guarded bases in the world. People have seen several aircraft in the areas near this New Mexico base too.


Fluoride Conspiracy Theories
- Height of Conspiracy: 1940s to Present
Years ago, there was a huge problem happening in the United States. Teeth were in a bad state, sometimes even rotting away. This was thought to be due to various causes, but perhaps the biggest was a lack of access to dental care. Fluoridation of the water was thought to be a big win in the U.S. as well as in several other countries. Many dental associations celebrated the move and have consistently hyped its effectiveness and safety. Opponents of the move equate it to things like vaccines, in that the people are not choosing to have this in the water and it, therefore, should not be. In theory, that makes sense.


9/11 Conspiracies
- Height of Conspiracy: 2001 to Present
On September 11, 2001, the United States was hit hard by a terrorist attack. People that claimed to be part of the Middle Eastern group Al Queda, led by Osama bin Laden, took over a few planes. They were able to enter the planes with weapons and make their way to the pilot deck. While at least one plane was taken back by passengers, two were used to hit the Twin Towers and World Trade Center in New York City. Everyone on board those planes was killed while many more inside or near the towers were killed too. Not to mention several first responders that passed. Many of those people would die from complications directly from things they inhaled that day. This has naturally started a lot of scientific conspiracy theories, where we’ve heard everything you can think of.


GMOs Are Highly Dangerous
- Height of Conspiracy: 1970s to Present
Genetically modified organisms, mostly known as GMOs, have been a huge part of the conspiracy theory territory for years. When we reference genetically modified foods, this is mostly revolving around crops. Opponents of GMOs claim that the government has suppressed proper data on the safety risks of GMOs. In fact, the government must be causing food shortages just to promote their modified foods. Even the U.S. Food and Drug Administration is in on it along with the American Association for the Advancement of Science. Most of the conspiracies around genetically modified foods have often been unrelated entirely to GMOs. For example, people tried to blame the Zika Virus on GMOs and even food safety at the famous Chipotle Mexican Grill.


Secret Cure To Cancer That Big Pharma Is Hiding From Us
- Height of Conspiracy: 1940s to Present
Cancer is a terrible thing, and it kills many people every year. The sad part about cancer is that it can be in various areas of the body, which is why there are so many different types. Some cancer can cause tumors and tons of other problems, as they all form at the cellular level. As sad as cancer is, we are making a lot of great strides when it comes to treatments. In fact, some people are able to do treatments early enough to go into remission. We can also remove some cancerous issues via surgery, which can allow people to never have to experience it ever again. Of course, it is possible for cancer to return but many in remission have remained in remission.


Governments Are Responsible For Natural Disasters
- Height of Conspiracy: 1900s to Present
It is actually pretty sad how often this specific concept is floated around. There are many people who are convinced that the government is responsible for major natural disasters such as hurricanes, tornadoes, earthquakes, tsunamis, and much more. This seems to go back to an earlier thing we mentioned revolving around contrails. As some are under the belief that either the United States government or all major world governments have control over the weather. Of course, this is one of the scientific conspiracy theories that seem to persist in nations like the United States more often. Mostly because many of these people also do not believe in climate change either.


The mRNA Vaccines Have Microchips In Them
- Height of Conspiracy: 2020 to Present
When the COVID-19 virus came around, we did not have any true way to fight it at the time. It was unlike all previous coronaviruses that had been seen up to that point, and none of the previous treatments seemed to be effective for everyone. While some benefited from similar treatment, most others did not. A vaccine was needed and companies like Johnson & Johnson and Pfizer were among the major places that were a huge part of this. Yet the big one was the Moderna Company. As a biomedical/biotechnology company, they worked a lot with RNA. They felt that vaccines could be created by modifying the RNA to do the same job that we used to do by introducing an inert version of the virus to a person in a vaccine.


The Earth Is Obviously Flat
- Height of Conspiracy: 17th Century to Present
Contrary to what some might assume, people have believed the Earth was flat along with several other shapes for centuries. Heck, Christopher Columbus thought it was shaped like a pear with a nipple on top. Seriously, he actually did. Others felt the Earth was flat, so if you went too far, you’d just fall off. Yet even before this, the Greek polymath Pythagoras referenced the idea of a spherical Earth back in the 6th century BC. Plato then wrote of a spherical Earth in the 4th Century BC and Aristotle provided essentially what was seen as empirical evidence for the spherical model. This is why we’ve known of the round Earth for a very long time. This is why scientific conspiracy theories like the Earth being flat are completely insane.


The Government Is Trying To Mind Control The Population
- Height of Conspiracy: 1900s to Present
If you have not had the chance to read our article on government experiments that they did not want us to know about, we recommend you check it out soon. It might actually make you think differently about this. It’s actually a complete fact that the United States government has researched several ways to control the mind. In fact, both the United States and the Soviet Union invested in psychics and those with extrasensory perception or ESP. The CIA declassified Russian experiments from 1991 back in 2021 where they referenced the Russians discussing ESP experiments. One of the scientists even claimed to have “perfected his methods.”


Climate Change Is Just a Hoax
- Height of Conspiracy: 2000 to Present
How did we get to a point where people do not believe in climate change? Well, in spite of the obvious evidence…this had been a major political campaign. You’d think that the people who mistrust the government more than any other would realize when politicians are lying to them. This was mostly a conservative talking point in America, and most who pushed against it were paid off by oil companies. Essentially, even though conservatives were actually the first to discuss man-made climate change in the late 1990s/early 2000s, they pulled back. They had to because so many were being paid off to do it. This allowed the liberals in America to pounce on their decision. It also made scientific conspiracy theories surrounding this easier to spread.


Vaccines Obviously Cause Autism
- Height of Conspiracy: 1980s to Present
We have probably discussed this issue countless times over the past few years on Science Sensei, yet here we are again. Perhaps the most vocal person on this topic has been the celebrity, Jenny McCarthy. Her son is autistic, and she seemed to notice the signs of autism after his earlier vaccinations. Yet autism is not exactly something vaccines actually cause. While they can cause some mild symptoms that usually go away within a few days to a few weeks, this is usually the extent of it. In fact, if they do cause something more problematic it is usually due to an allergic reaction to something in the vaccine. Doctors can trace the substance the child is allergic to and even help with their symptoms.


The Moon Landing Never Happened
- Height of Conspiracy: 1969 to Present
The Moon landing in 1969 was an incredible thing. We actually have more technology in our cell phones today than they had on the entire shuttle. We really need to give NASA more credit for being able to send astronauts into space in spite of their limitations. Today, you can still view our flag on the moon, though, it’s probably white by now thanks to space debris. On top of that, NASA also left its mark on the moon beyond putting an American Flag on it. This is why they left reflectors that you can see through a telescope if you look at the Moon close enough, in the spot the team landed on. Why are we even seeing so many just disbelieving we ever went there?


The Medical Community Has The Cure For Diseases But Doesn’t Want You To Know About Them
- Height of Conspiracy: 1920s to Present
Sure, the medical community would probably make less money if they just gave cures to people for every ailment. However, that does not mean cures exist. In fact, some illnesses cannot be cured at all. Of course, we do have things that can help people, but it does not always work as simply as people assume. For example, if you have an infection, your body has to fight it off. Antibiotics are used to help with the symptoms that infections can cause. Those antibiotics are not going to get rid of the infection, however, as it’s the body that must do this. If it cannot, then antibiotics are not going to do the person any good. In these cases, they may have to be hospitalized. Most who believe in scientific conspiracy theories like this are from the United States.


The Illuminati And New World Order Are Controlling All Science & Technology
- Height of Conspiracy: 1770s to Present
The New World Order has been used as a major conspiracy theory for years. It was such a popular theory in the 1990s that the pro-writing company, WCW, used the name for a faction or team. The “NWO” moniker then became more synonymous with that than its original meaning. The idea behind this is that there is a secret world government that’s truly calling the shots. The same exact concept is connected to the Illuminati group. This was actually a real group founded back during the Enlightenment era in May of 1776 in Bavaria. This was a secret society that opposed superstition, obscurantism, and religious influence over the lives of others…especially in state power. Along with the Freemasons (who they comingled with), an edict was passed by Charles Theodore that outlawed secret societies.


Birds Aren’t Real
- Height of Conspiracy: 2017 to Present
In response to conspiracy theories, a 23-year-old man named Peter McIndoe decided to spread a rumor that “Birds Aren’t Real” back in 2017. McIndoe remained in character when selling this conspiracy for years. Even when he did a December 2021 interview with the New York Times about it. He claimed that birds are not real but rather, all are just surveillance drones made by the United States Government. The Birds Aren’t Real campaign actually has a real-life staff, organizes real protests, and even bought real billboards. They even put their claim on the side of vans over the years.

Where Do We Find This Stuff? Here Are Our Sources:
National Institutes of Health (NIH)
Centers for Disease Control & Prevention (CDC)
Central Intelligence Agency (CIA)
World Health Organization (WHO)
United Nations (UN)
National Aeronautics and Space Administration (NASA)
United States Environmental Protection Agency (EPA)
United States Food & Drug Administration (FDA)
Federal Aviation Administration (FAA)
National Oceanic and Atmospheric Administration (NOAA)
American Association for the Advancement of Science (AAAS)
International Service for the Acquisition of Agri-biotech Applications (ISAAA)
American Cancer Society (ACS)
Queensland Government
Harvard University
Ohio State University
Portland State University
Scientific American