Browse and explore dozens of major psychology theories

What is psychology? An overview

What is psychology and why should we study it? This short video from Macat explains how the subject has developed over the years and introduces some of the key thinkers and ideas.

Who was Freud and what did he say?

Sigmund Freud is one of the most famous psychologists and is widely cited—but do you really know the basics of what he taught? Here's a super brief breakdown of his major insights.

A full crash course in psychology

This 40-episode crash course series mirrors the curriculum of an advanced high school class on the psychology with well-known creators the Green brothers. Browse each roughly 10-minute episode or watch them all.

Explore an interactive map of the unified theories of everything

This interactive concisely describes many highly complex theories ranging from quantum gravity and black holes to dark matter and energy. Supplementary resources, key questions, and possible solutions accompany each description. As of 2026, no developed theory provides an accepted explanation of all observed phenomena in the universe at all scales.

Four psychological tools for a happier, calmer life

The perennial debate on how to be happy involves various aspects of life, and one of the most essential is our psychological attitudes toward experiences. This piece lists and explains four basic tools to strengthen your "psychological immune...

Problem solving, problem recognition, and learning ability makes up intelligence

Psychologists have several theories from which the concept of intelligence is explained, including general and multiple intelligences. Although IQ is used to quantify intelligence, issues like its cultural biases have spurred debate.

Drugs 101: An interactive guide

What's the difference between opioids and psychedelics? This guide details specific drugs and their various associated effects. Drugs in this wheel fall into seven categories: stimulants, depressants, empathogens, psychedelics, dissociatives, cannabinoids, and opioids.

Visualizing 11 cognitive biases that influence how you think

Humans are hardwired to make mental mistakes called cognitive biases, affecting the way we view our world. Among the most common are confirmation bias (seeking only evidence that affirms your views), authority bias (overweighting things said by authority figures), groupthink (assimilating ideas to avoid conflict), and more. This quick chart gives an overview of some of the most notable ways we mislead ourselves.

Why the Myers-Briggs test is pure entertainment

The world's most popular personality test isn't used by academic psychologists—but hundreds of companies and thousands of colleges use it to place workers and students. Here's why it's so popular and likely overused.

Psychology research shows that conspiracy theorists tend to have a desire to be unique

While conspiracy theorists are often understood to have feelings of powerlessness in their lives, research suggests they may also be inclined to set themselves apart from the masses.

A list of five scientific theories that were accepted and later disproved

Humoral theory held that everyone's personality derived from different combinations of four bodily fluids: blood, phlegm, yellow bile, and black bile. The phlogiston theory stated that all combustible materials possessed a fire element—phlogiston—that was released and absorbed by the air during burning. When the air became saturated with phlogiston, the fire would go out.

An encyclopedia of anthropology

This online database offers articles and additional resources for all things anthropology. This free resource is filled with peer-reviewed entries that cover topics ranging from addiction to writing, and offers anthropological insight into more...

An existentialist reading list

If you’re looking for a starting point for diving into existentialist thought, this is a great resource. Its titles are not exactly obscure—Albert Camus’ “The Stranger,” Franz Kafka’s “The Trial,” and Søren Kierkegaard’s “Either/Or” are among the most famous works in Western literature—but the list provides some digestible context for each text, which will help you decide the best place to begin your journey.

Are we too attached to attachment styles?

Attachment theory was developed to help understand the impact of caregiver relationships on children. Recently, the theory has been applied to adults, categorizing them into different attachment styles. Is it accurate? This podcasts takes a closer...

The science of springtime, 101

Dive into the basics on springtime including the astronomy that brings it about, natural signs of spring's arrival, and some of the cultural approaches to the season.

A guide to the romance genre's major tropes

This guide breaks down romance's most prominent tropes, or narrative patterns, used by romance writers and adored by their fans. After you learn about "friends to lovers," "marriage of convenience," and "forced proximity," you'll start to see your favorite romance reads in an entirely new light.

Panpsychism suggests that all matter possesses consciousness

The theory describes consciousness as a fundamental, ubiquitous property, rather than separate or emerging from matter. Cosmopsychism posits that the universe is conscious, while some critics argue that consciousness itself may be an illusion.

Breaking down the music theory of Hitchcock's 'Psycho'

One of the defining features of Hitchcock’s film “Psycho” (1960) is the music, especially the sounds you hear during some particularly grisly scenes. This analysis from The Music Professor analyzes how that music complements the film, highlighting the way strings match the intensity of the film’s screenplay and black-and-white cinematography.

Couples therapy has seen a massive boom in recent years

70% of therapists offer couples counseling. Experts predict continuous growth in the field. With so many marriages ending in divorce, more couples are recognizing the potential for therapy to get them back on track. And parents are starting to see the impacts of divorce on their children and their own mental health.

Having five of nine key symptoms constitutes a major depression

Before professional standards were adopted, practitioners used varying criteria to diagnose mental health disorders. By the 1970s, more objective lists were organized, culminating in this list of polythetic criteria—a list of symptoms where no single criterion is required, but a minimum number must be present.

Political typology quiz

Where do you fit in the political typology? Take this quiz to find out which political typology best matches your views. Sixteen questions serve to filter political views across nine typology groups. These groups include: Progressive Left;...

Autism Spectrum Disorder, defined in 2013, was previously categorized as numerous disorders

This exploration of ASD history walks through how autism science and diagnoses have evolved over the decades, including the new category in the DSM-4 in 1994 that created Asperger's disorder and pervasive developmental disorders, and the new, broader ASD definition in 2013 in the DSM-5 that has led to more diagnoses.

The genetic links between different dog breeds

There are nearly 400 modern domestic dog breeds with unique histories and genetic profiles, many of which share genetic traits based on their geographic origin. This visualization captures the links between 150 common breeds—for example, boxers share genetic variants with 11 of 16 breeds of European Mastiff, along with five others outside of that group. Explore which breeds your pet is linked to with this chart.

Breaking down the golf world's 4 'major' tournaments

The PGA Tour features over 30 tournaments per year, but none are as important as the four majors: the Masters, the PGA Championship, the US Open, and the Open Championship. This Golf Monthly article dives into each major and the courses it is played on, including the traditions each weekend brings to the Tour.

There are more than 300 different thematic ETFs

Exchange-traded funds seem to offer something for everyone. As tracked by ETF.com, there are 338 thematic ETFs, offering exposure to “baskets” of stocks covering global infrastructure, genomics, cannabis, and more.

See these 16 pieces of art evoking phobias of snakes, flying, spiders, and more. 

See how each of the more than two million known species relates to each other—and to common ancestors—in this zoomable tree of life.

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.

In recent years a child anxiety expert has created and tested a novel phobia and anxiety treatment approach for children, focused on changing how parents respond to the fears.

Explore a list of the 100 best novels of all time, compiled by some of the world's best living writers, including Salman Rushdie, Stephen King, and Jennifer Egan.

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

A century of Billboard issues documenting the evolution of popular music.

Researchers believe the brain consolidates memories, processes emotions, and plans for the future during dream states

Trace how the Bill of Rights, inspired by centuries of political theory, took shape between 1774 and 1789.

Browse a detailed visual analysis of over 200,000 similes—comparisons that often use 'like' or 'as'—from popular fiction to see how frequently writers the same idiomatic expressions.

Read a deep dive on the 'all-purpose healing' peptide BPC-157.

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.

Use this tool to calculate the dollar value of your parental mental load, from meal planning to coordinating after-school care, then see resources that help generate solutions.

View the ten deadliest tornadoes in US history.

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

The hormonal disorder PCOS was renamed PMOS in 2026, a move designed to improve care and research by shifting the focus to the hormonal causes of this condition that affects 1 in 8 women.

Existentialist writer Jean-Paul Sartre coined the famous phrase 'Hell is—other people' in his play 'No Exit'

Three Ebola species are responsible for most large outbreaks of the disease, yet the only approved Ebola vaccine is known to work against just one of them.

After her fellow cult members tried to kill her with an LSD-infused hamburger, one member of the Manson Family, the murderous cult led by Charles Manson, decided to testify against the group's leader.

Most of the observable universe's volume consists of voids and supervoids—enormous regions of space with little to no galaxies, stars, or light.

The syncytiotrophoblast is the outer layer of the placenta and the largest human cell, spanning an area about twice that of a king-sized bedsheet.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

The first steps to rebuilding your credit score include getting to know exactly what's on your credit report and figuring out how far you are from the '700 club,' or 'good score' range.