There’s something undeniably intriguing about conspiracy theories that have a scientific twist. In this article, we dive into some of the most intense theories (such as whether the Earth has already been swallowed by a black hole since 2012!) as well as some that are surprisingly harmless and even amusing. One thing is certain—you’ll never view bird feeders the same way again. So buckle up, grab your tinfoil hat, and join us on a journey through ten conspiracy theories grounded in science and debunked by it.
10. The Flat Earth Theory

Humans have understood that the Earth is spherical for over two millennia. Or have we? The Flat Earth Society (FES) insists that this widely accepted idea is wrong. Despite an ancient Egyptian scientist named Eratosthenes demonstrating the Earth’s round shape and even calculating its circumference, and despite having actual footage of the Earth spinning, the FES presents a completely different view.
The core of the FES argument is summarized in a few key points. According to their website,
- “The horizon seems to always meet the viewer's eye level, which is said to be impossible on a spherical Earth.”
- “The surfaces of bodies of water have consistently been observed to remain level.”
- “Even from an airplane, the curvature of the Earth remains undetectable.”
Although this theory presents itself as scientific, it quickly collapses when scrutinized through the lens of actual science.
9. Water Fluoridation

Fluoride refers to a collection of compounds containing the naturally occurring element fluorine, along with one or more other elements. These compounds can naturally appear in water and soil in various concentrations. In the 1940s, research revealed that people living in areas with naturally occurring fluoride in their water tended to experience fewer cavities. Fluoride was later discovered to prevent and even reverse dental decay by inhibiting acid-producing bacteria and aiding in the remineralization of tooth enamel.
Grand Rapids, Michigan, became the first city in 1945 to introduce community water fluoridation. By 2008, over 72% of the U.S. population using public water systems had access to fluoridated water. However, this practice sparked its own share of controversy and conspiracy theories.
There were those who thought the government added a substance to the city's water supply to dull the masses, with claims that it was a mind-controlling chemical known as 'fluoride'—intended to deceive people into believing it was beneficial. Some even speculated that fluoride was used to reduce the intelligence of children. Rumors ran wild, suggesting the entire fluoridation initiative was merely part of a communist scheme.
8. The ‘Birds Aren’t Real’ Theory

Next up is a conspiracy theory with a scientific twist, which has been circulating since at least 2017, although its proponents claim it has roots in the 1950s. It's essential to clarify right away that this theory started as a comedic satire, poking fun at conspiracy theorists. Still, the group behind it boasts over 300,000 members on both Reddit and Instagram.
As absurd as it sounds, the ‘birds aren’t real’ theory is remarkably straightforward. The theory suggests that the U.S. government secretly swapped out all birds for robotic versions equipped with surveillance tools, cameras, and tracking systems. It’s claimed that birds perch on power lines to charge their batteries, while their droppings are supposedly used for tracking purposes.
Initially a parody, the ‘birds aren’t real’ theory raises an intriguing question: how many so-called ‘genuine’ conspiracy theories also began as jokes?
7. The Moon Landing Conspiracy Theory

From ancient times, humans have been fascinated by the Moon, the Sun, and the stars. With the advancement of science, we've gained greater knowledge, but one particular conspiracy theory has endured since the 1970s.
A group of individuals believes that the Moon landing was a hoax, allegedly staged and filmed on a soundstage. This theory suggests that the U.S. government orchestrated the landing to boost national pride and demonstrate supremacy over the Soviets during the Cold War.
The main piece of “evidence” cited by proponents of this theory is that the flag on the Moon appears to flutter, even though there’s no atmosphere in space to cause wind. While there is a scientific explanation (inertia), this conspiracy theory still attracts a considerable following.
6. Chemtrails Point to Government Control

Under certain weather conditions, you can often spot thin cloud trails behind planes, sometimes visible long after the aircraft has passed. These are called contrails, created when water vapor from planes condenses in freezing temperatures, leaving behind ice crystal streaks. There's nothing suspicious about them; it’s just basic science.
However, conspiracy theorists claim otherwise. In the 1990s, rumors started that these contrails were actually “chemtrails.” According to this theory, the government was using planes to spray harmful chemicals into the atmosphere for purposes such as manipulating the weather, poisoning the environment, or even sterilizing the population. Proponents argue that the lingering trails are evidence of extra, hidden substances being sprayed.
5. Links Between Vaccines and Autism?

While many people think of vaccines in relation to the recent pandemic, there’s a conspiracy theory about vaccines that has persisted since the 1990s. This theory, proposed by some scientists like Andrew Wakefield, suggests that vaccines may increase the likelihood of a child developing a behavioral disorder, such as autism.
This theory might appear to have a scientific origin since it was first put forward by a researcher. However, there is overwhelming evidence to the contrary. Numerous studies by the CDC and other reputable organizations have found no connection between vaccines and autism. The scientific consensus supports this view, but many people continue to believe the conspiracy due to deep mistrust of the medical community and government institutions.
4. Bigfoot Conspiracy Theory

Over the years, there have been thousands of reported sightings of Bigfoot, or Sasquatch, especially along North America's northwest coast. Even scientists, known as cryptozoologists, along with documentary filmmakers and photographers, have devoted their careers to uncovering this elusive creature. But why hasn’t anyone managed to capture a clear photo or video? It's probably because Bigfoot doesn’t exist.
Much of the confusion surrounding Bigfoot could stem from the numerous hoaxes that have been tied to the legend. Some examples include:
- Two men from Georgia who claimed to have discovered a Bigfoot body, only for it to be revealed as a rubber ape costume.
- Countless doctored and fake videos and photos.
- A fabricated academic journal claiming to have found Bigfoot DNA. (Learn more here)
Even without scientific proof, people still find the idea of these mythical beings fascinating. Numerous podcasts, YouTube channels, and TV and radio shows continue to discuss the search for Bigfoot. Out of all the conspiracy theories, this one might be the most fun to imagine. It seems that the Bigfoot conspiracy is largely a lighthearted pursuit.
3. 9/11 “Inside Job” Conspiracy Theory

The September 11th attacks are a moment that most people will always remember. Many can recall exactly where they were when the Twin Towers fell. Despite this, one of the most persistent conspiracy theories in the U.S. is that the attacks were orchestrated from within the government.
Conspiracy theorists claim:
- The Bush administration had prior knowledge of the attacks and either allowed them to happen or, in some extreme theories, actively planned them.
- Since jet fuel doesn’t burn hot enough to melt steel beams, the destruction of the World Trade Center towers must have been the result of a controlled demolition.
This theory has lingered for a few reasons. One major factor is that the prolonged Iraq war failed to uncover any weapons of mass destruction, which was cited as the primary justification for the invasion. Additionally, many people have a general mistrust of the government and suspect that the true events have been hidden. The minimal evidence supporting the “inside job” theory has been debunked time and time again.
2. CERN Blackhole Conspiracy Theory

This theory suggests that the world actually ended in 2012. According to the CERN (Conseil Européen pour la Recherche Nucléaire) conspiracy, when CERN discovered the Higgs Boson (also known as the God particle), it accidentally created a black hole. The black hole then consumed the Earth and everything on it.
CERN is also tied to various other science-based conspiracy theories:
- Some theorists believe CERN is using the large hadron collider to open the gates of hell.
- Others accuse CERN of trying to summon a deity, such as the Celtic god Cernunnos or the Indian goddess Shiva.
- There are also claims that CERN is conducting experiments with time travel.
All we can do is hope that CERN uses its immense scientific capabilities for positive purposes.
1. New World Order/Illuminati Headquarters

For this list, we won’t dive too deeply into the Illuminati (feel free to explore that here instead). In brief, the Illuminati (and the New World Order, or NWO) are believed to be secret organizations that covertly control the world’s affairs.
Often referred to as “the deep state” by conspiracy theorists, the NWO is blamed for causing nearly every societal issue. But where could such a shadowy group meet to carry out their secretive schemes? According to theorists, it’s the Denver International Airport! Here are some of the reasons they believe the airport serves as the Illuminati’s headquarters:
- Murals featuring imagery linked to Nazi symbolism.
- A plaque mentioning the “New World Airport Commission.”
- An interactive gargoyle that mistakenly welcomed visitors to the “Illuminati Headquarters” before being fixed. (This may have been a prank by the airport itself).
The conspiracy theories surrounding the New World Order and Illuminati go even deeper. You can find out more about Ten Insane Conspiracy Theories About the New World Order here.
