The liver circulates blood while the heart circulates “the vital spirit” Second-century physician Galen theorized that it was the liver that circulated blood, bile and phlegm, while it was the heart that circulated the “vital spirit.” He said that the blood is consumed by the organs as fuel and it moves in a back-and-forth motion.

Alchemy It was basically the pursuit of creating gold, or rather creating gold out of other substances. The only problem was that the alchemists needed to find the philosopher’s stone which was the magical key to not only initiating this transformation but also to eternal life. It remains unfound.

Spawn theory According to Aristotle a creature could arise out of an inanimate (or formerly animate) object, as a maggot “grows” from rotting meat. As crazy as it sounds people believed this straight up until the 20th century with scientific experiments even being conducted.

Homeopathy Basically the art of scamming sick people out of their money homeopathy isn’t even a scientific theory. The only reason we put it on this list is because it’s a sham and the people who practice it claim that it’s science. Don’t get sucked in.

Lambs grow like weeds The ancient Greeks were the first to have the crazy idea that a lamb could grow right out of the ground, with a stem attached to its navel. Pliny the Elder later mentioned it, and Europeans picked up the idea again in the 14th century.

Phrenology: Read your friends head like a crystal ball By taking measurements of the skull, phrenology’s founder Franz Josef Gall argued around the turn of the 19th century, you could determine a person’s personality traits, propensities, and intelligence. We bet he made a lot of money.

White holes exist There’s black holes that suck everything in and then there are white holes that supposedly spit everything out. According to some scientists, if white holes exist then they may be linked to black holes in the exact manner we just described

We kill the universe every time we look at dark energy Professor Lawrence Krauss once stated that we kill the universe every time we look at dark energy, which, as we know today, makes up 70% of the universe. According to the theory, we keep the universe unstable and reduce its lifespan as we continuously observe it…although negligibly.

The universe is a hologram This theory suggests that we are not living in an elaborate computer program but that the universe we live in is just a hologram made by the universe itself (aka an anonymous hologram creator). It tries to explain that what we see when we look at the sky is just a wall containing an image of galaxies and stars.

We live in a matrix universe Although we’re all familiar with the movie, scientists have also theorized that humans live in a computer program. These scientists believe that computers are the ones that stimulate our consciousness and form what we consider reality.

A universe with many black holes has several baby universes This theory arose from the theory that we are a child of a black hole. The idea is that when matter is pulled into a black hole, it becomes so dense that the black hole spits it out and forms a universe from it. Remember white holes?

We create a universe every time we make a decision This theory takes a different approach to the theory of the omniverse, or having many worlds. It states that we give birth to a new universe every time we make a decision since that is how we create reality.

Our universe is constantly smashing into a neighboring universe According to the Clashing Branes Theory, our universe is a membrane floating in higher dimensional space and constantly smashing into a neighboring universe. This theory leads to the idea that a new big bang is produced every now and then which in turn leads to even more universes.

Space-time is a super-fluid substance The theory that space-time flows with zero friction is considered to be one of the most bizarre theories of this century. According to physicists Pawel Mazur and George Chapline, if space-time is super-fluid, then that means that the rotation of the universe causes super-fluid space-time to scatter with vortices, and that those vortices give birth to galaxies, causing the never-ending expansion of the universe.

Universes continue to evolve, and those with the most black holes dominate the multiverse A scientist once theorized that when matter is compressed to extreme densities at the center of a black hole, it leads to the creation of a baby universe. These universes continue to evolve, make a lot of black holes, and dominate the multiverse.

The universe we see is hospitable; otherwise, we would not be here to observe it The anthropic principle states that every universe in the multiverse has an almost infinite range of different properties and physical laws, and that we are here because the universe where we are is hospitable. This theory was eventually dismissed by some as being non-science.

Diseases are caused by the imbalances of the “four humors” For hundreds of years doctors attributed diseases not to germs but to the imbalance of what they called “the four humors.” These humors, or temperaments were first proposed by Hippocrates and referred to the different amounts of four supposed bodily fluids in any given person.

Fire is made of an element called Phlogiston In 1667, a physicist named Johann Joachim Becher proposed to add another element to the already existing list of chemical elements on Earth—Phogiston. According to Becher, all combustible elements contain this stuff and release it when they burn. Today, Phogistan only exists in the history books.

The seeds of life were brought to earth through meteorites, asteroids, etc Also called the Panspermia Theory, this old belief suggests that life actually exists throughout the universe and that it just ended up on Earth via some sort of space rock.

Life on Earth started from garbage Often considered one of the silliest theories ever, the Garbage Theory states that the origins of life on Earth can be traced back to billions of years ago, when aliens dumped their trash on Earth.

The whole universe is a computer The “computer is the universe” theory states that the universe itself is the computer in which we live in. In essence, black holes, galaxies, stars and all of that act as the circuits and processors of a gargantuan motherboard where the most fundamental component of the universe is not a unit of matter, but a “bit”. Yes, literally the same boolean piece of data your computer uses to print this page, go figure.

The universe works like a mechanical clock According to the Clockwork Universe Theory, the universe is just like a mechanical clock controlled by a supreme being who uses the laws of physics as its gears to make everything in the world determinable. Unlike other scientific theories involving God, this theory limits His role to just setting the universe into motion. However, this theory was rejected by the Quantum Theory.

Zoo theory The Zoo Theory suggests that aliens exist but would never make their presence known to humanity so they cannot exert an influence on human development. This theory suggests that we are like animals being observed in a zoo, being monitored by aliens who would not make contact with us until we reach a certain level of advancement.

Our universe started by colliding with another universe. Unlike the Big Bang Theory where the universe began from a singularity, the Ekpyrotic Model of the Universe suggests that the universe arose from the collision of two three-dimensional worlds in space. This means that aside from our universe, there is at least one other universe out there and that our twin universe is separated from us by a distance that is allegedly less than the diameter of an atom.

Life on the Sun Although today we know that the sun is basically an enormous nuclear furnace, in the 1700′s people thought differently. Even William Herschel, the discover of Uranus, thought that sunspots were actually mountains peaking through the layer of clouds.