What is the Gini coefficient?

The impact of greenhouse gases is assessed as a measure of Global Warming Potential

Since 1990, the Intergovernmental Panel on Climate Change has used GWP to measure how much energy 1 metric ton of a gas emits over a given period—usually 100 years—relative to 1 metric ton of carbon dioxide. By definition, carbon dioxide has a GWP of 1.

The Reynolds number is the ratio of viscous and inertial forces in fluids

It can approximate fluid behavior in simple systems by non-dimensionalizing—removing the units within—the Navier-Stokes equations. A value close to zero indicates that the fluid will exhibit laminar flow, while a large number suggests that turbulence will occur.

A comprehensive state-by-state report of LGBTQ+ rights in America

The State Equality Index (SEI) is a comprehensive state-by-state report that provides a review of statewide laws and policies that affect LGBTQ+ people and their families. The SEI rates all 50 states plus Washington, D.C. in six areas of law. Each...

The Dow Divisor keeps the index consistent through time

To adjust for stock splits, mergers, and replacements, the DJIA uses a figure called the Dow Divisor. Originally valued around 12 in 1896, and now less than one, it ensures today’s index levels remain comparable with the past.

What is a singularity?

It's hard to imagine a singularity, which are described as an infinitely tiny point, created by gravity, until it has zero volume. The definition feels impossible, though perhaps not at the center of a black hole or at the beginning of the universe. Even then, singularities may be something else entirely. Singularities are a mathematical quandary that challenge us to better understand physics and the universe.

Author John Green explains the Gilded Age

The Gilded Age was a time period that stretched from the 1870s until the turn of the 20th century that was colored by rapid industrialization, economic change, and widespread financial inequality. It was named as such because the widespread poverty during this era is often overshadowed by the fact that it was also a golden age for wealthy individuals.

See how the income taxes in the US compare to other countries

The US's highest marginal income tax rate is 37%. That rate is compared to other countries' both in a map and accompanying chart. Denmark has the highest rate at nearly 56%, while a handful of countries don't use marginal taxes at all. In the Middle East, many countries count on oil and gas to finance their governments.

Carried interest is a share of the profits that a venture capital firm’s general partners earn

Also known as "carry" for short, carried interest is roughly 20% of a fund’s returns, but the exact percentage varies between firms.

The gig economy is a labor market in which workers earn money through on-demand jobs

These “gigs” are often temporary or flexible tasks, such as driving for Uber. Colloquially, the term “gig economy” usually refers to people doing jobs where they connect with people who request their services through an app.

The golden ratio is believed to underlie patterns in nature and beauty

The irrational mathematical constant has been cited in art, architecture, and nature since its origins in ancient Greece. Its connection to the Fibonacci sequence has associated it with spiral patterns in pineapples, pinecones, and other plants.

What are business credit scores?

Businesses have credit scores the same way individuals do—with a few key differences. For one thing, business credit scores range from 0 to 100 instead of 300 to 850, and are based on factors such as bankruptcy and bill-paying habits.

Where you fall on the sports misery index

Only one team can win it all each season, which means the majority of fans are disappointed. This bot mines the data on how your teams have performed in recent years and measures your misery index (the higher, the more miserable).

See the increase in financial crimes globally on a map

The Global Organized Crime Index tracks annual shifts in organized crime, ranging from drug and human trafficking to financial crimes. The map shows crime levels for each country, as well as a profile of the country's annual shifts.

Did agriculture give rise to inequality?

This article explores how economic and social inequality relates to the rise of agriculture. About 10,000 years ago, some hunter-gatherers started farming, launching what came to be known as the Neolithic revolution. Hunting and gathering allowed...

What the heck is a polygenic risk score?

Being able to predict an individual’s risk of common conditions is regarded by many as the holy grail. So, where are we now?

The UV index measures the sun's ultraviolet radiation risk on a scale of 1 to 11+

The tool takes into account geographical location, time, elevation, and cloud coverage to help individuals plan their daily activities around the sun's peak UV exposure times, which occur from 10:00 am to 4:00 pm. A value at or above 6 requires sunscreen (SPF 15+), shelter, or UPF clothing

Grit: passion combined with perseverance over an extended time

Roughly defined as a balance of perseverance and passion, Angela Duckworth defines this combination as an essential component of reaching long-term goals. Not merely about talent or luck, Duckworth argues the personality trait enables individuals to maintain their commitment to significant objectives over extended periods, despite facing challenges and setbacks.

The average wealth gap between homeowners and renters was more than $1.3M in 2022

In 2022, the median wealth gap between homeowners and renters was closer to $390K—a significant divide. Over the past three decades or so, the median wealth gap between homeowners and renters increased by 70%, while the average wealth gap increased by more than 250%.

The GENIUS Act passed in the US in 2025 was a major milestone for stablecoin regulation

GENIUS stands for the "Guiding and Establishing National Innovation for US Stablecoins." The GENIUS Act defines payment stablecoins as digital money rather than investments and was the first significant piece of stablecoin legislation in the United States.

China had an inflation rate of -0.4% in August 2025

As opposed to other G20 countries that are largely struggling with high inflation rates, China is facing deflation. Sluggish growth in the country's once booming real estate market is just one glimpse into the consumer slowdown triggering deflation.

An annuity income calculator

This interactive calculator lets users estimate how much money they can expect in their annuity payouts, depending on factors such as how much they invest and how long they expect to be paid. It also shows how the principal will deplete over time.

The Michelin Guide is the gold standard in fine dining

Michelin may be chiefly concerned with tires, but it's also known for its restaurant rating system, commonly referred to as “Michelin Stars.” The guide awards restaurants between one and three stars to designate varying levels of excellence in cuisine.

Ten people on Goldman Sachs’ 31-person senior management committee are women

However, only two of those 10 women were in charge of a revenue-generating business arm. Learn more about what it’s like to be a woman in investment banking—and about Goldman’s recent gender discrimination settlement.

Why are some people left-handed?

About one-tenth of the world’s population are left-handed. Why does the trait exist in the first place? This five-minute video investigates how the uneven ratio of lefties and righties gives insight into a balance between competitive and cooperative pressures on human evolution.

How the GNU General Public License ensures software remains free and open

Rather than copyright, the free software license is based on the principles of copyleft—users are allowed to use, modify, and distribute software without charge, provided that any derivative works remain free. The license was introduced in 1989 by Richard Stallman, who founded the Free Software Foundation to promote the accessibility of software.

In 2026, Finland was named the world's happiest country for the ninth consecutive year based on its wealth, social safety network, and high life expectancy, among other factors.

An initial public offering or 'IPO' is the process of a private company becoming public by putting shares of the company on the stock market for purchase.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

The price of gas is a composite made up of several different factors, with the federal gas tax making up less than 20% of what drivers pay at the pump.

Hedge funds, the private investment firms that trade a wide swath of financial assets, make money by imposing steep fees on investors and from the fund's investment performance.

Warren Buffett's former professor Benjamin Graham is known as the 'father of value investing,' a strategy in which investors seek to buy stocks trading below their intrinsic worth.

Dozens of S&P 500 stocks, including Coca-Cola and Walmart—known as the dividend aristocrats—have increased dividends every year for 25 years

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.

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Up to a million Girl Scouts sell about 200 million cookie boxes every spring, generating $800 million, largely because refusing a child is frowned upon

Art theft is the third-largest source of criminal revenues worldwide, thanks in part to the subjective nature of valuing a work of art.

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.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

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

Ebola is a filovirus, meaning it resembles a thread under a microscope, though it sometimes twists and can resemble a bowl of spaghetti.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

Visualize how CRISPR-Cas9—a type of immune system used by single-celled organisms to attack invasive viruses—targets and makes precise changes to a gene's DNA.

See a ranking of the best (and worst) Federal Reserve Chairs since 1914 out of the 16 men and women who have held the office since.

The Brothers Grimm were lawyers before they were storytellers, but became interested in fairy tales as they began investigating how rules and customs had been passed down through cultures.

Hurricanes, which rely on air consistently spinning in the same direction, cannot cross the equator because air curves in opposite directions north and south of it.

Iran's Revolutionary Guard Corps is independent of Iran's regular army and is one of the most powerful and influential military-political organizations in the Middle East.

A pickleball's loud 'pop' sound can reach 120 decibels, which is equivalent to a hammer hitting a nail

Apeirophobia is an overwhelming fear of living forever, perhaps stemming from the brain's inability to conceptualize an infinite life.

Poison ivy's characteristic rash is caused by an allergic response to an oily compound in the plant called urushiol.