What is the Gini coefficient?

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.

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.

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.

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...

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.

While the concept of infinity refers to a countless set of items, these infinite sets can be compared to one another by matching an item from one set to an item in another, one by one. This analysis shows that certain sets must be larger than others because some infinite sets have leftover, unmatched items.

The US government historically makes nearly half of its total revenue last year from individual income taxes. But the US makes also makes money from a variety of other sources, including Medicare taxes and corporate income taxes. However, the federal government has run a deficit since 2001—reaching a peak of $3.13T in 2020.

The Dow and S&P 500 are both indexes meant to provide a broad representation of the economy. The Dow has 30 companies and is weighted by share price, while the S&P 500 has 500 different companies weighted by market capitalization. Since the indexes are so different, investors don't always agree on which index is a better representation of the economy—though the two move in the same direction more than 90% of the time.

In an interview, she explains that gig economy workers come in two groups: people who are earning supplemental income on the side of a full-time job, and people who depend on gig work for their entire incomes. As it turns out, those groups feel very differently about the gig economy.

The R0 value is a basic measure of how many people an infected person will transmit a pathogen to, on average. If R0 is less than 1, transmission dies out; if greater than 1, an outbreak is likely. Measles has one of the highest known R0 values at almost 18, meaning that after four transmission steps, more than 100,000 people could be infected.

The Consumer Price Index is a metric that attempts to capture price changes felt by consumers by averaging a basket of about 80,000 items, each weighted to reflect the impact of changes on households.

In the US, the top 1% of earners contribute 45% of all personal income taxes collected nationwide. But not all states are created equal when it comes to income tax. Some states are more dependent on the 1% than others for tax revenue. SmartAsset recently examined IRS tax return data to determine exactly how much the top 1% of earners in each state paid in taxes. Find your state here.

Taxes are a major revenue source for most countries, and how each government taxes citizens often reflects the country's economy. Developed countries tax at much higher rates than developing ones, and as a country grows its GDP, it also typically grows the proportional percentage of taxes it gains from its citizens.

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

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.

In a given year, the value of the S&P 500 can significantly fluctuate. An intra-year drawdown is the most significant difference between the index's peak and lowest point.

This 20-question survey, first established in the late 1970s and subsequently revised and often adapted, aims to measure the subjective experience of loneliness. Respondents rate various items on a scale of 1 (Never) to 4 (Often). One revision of the test (not included here) offers an abbreviated three-question version that focuses on how often you feel companionship, left out, and isolated.

An analysis by the International Energy Agency found that in 2021, the top 1% of emitters each produced over 50 metric tons of carbon dioxide, over 1,000 times the amount produced by those in the bottom 1%. The average energy-related carbon footprint, including household heating and electricity use, was about 4.7 metric tons per person.

Russian mathematician Georg Cantor demonstrated that certain sets of numbers (e.g., the natural numbers) form countable infinities, while others cannot be counted (e.g., the real numbers) and are therefore uncountable, representing larger versions of infinity. Through the axiom of choice, German mathematician Ernst Zermelo proved this concept of ordering infinities.

It's typically expressed as an annualized percentage that incorporates both the size and timing of cash flows between investors and the fund. It's the discount rate that makes the net present value of all cash flows equal zero. Many private equity funds target a net IRR in the mid‑teens to low‑20s percent range, with an 8% "hurdle" or preferred return as a minimum before carried interest or "carry" is paid.

Discover data about each generation’s income in the US. Generation X currently holds the title of highest earners, with notable wealth for those living in Maryland. Find out which groups tend to succeed and why, while seeing where you stand in comparison.

Unlike most indices, which weigh companies by market value, the DJIA is price-weighted—meaning higher-priced stocks have more influence on its movements. As a result, a company’s share price matters more than its overall size.

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).

The lipstick index is an economic theory that breaks down to this: when consumers think an economic downturn is looming, sales for affordable luxury items (such as lipstick) go up. While it's not an economically proven theory, it's still worth considering. So why do consumers exhibit this behavior? Read more about the lipstick index to find out.

Since the modern federal estate tax was implemented, people have felt strongly about whether or not to keep it. Much of the debate boils down to equality: Proponents say the tax creates better income equality between the rich and poor, while opponents say it's an inequitable tax only placed on the wealthy.

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.

WalletHub researchers evaluated not just income taxes but real estate, sales, and other levies in order to rank every state by its total effective local and state tax rate (not including federal). Alaska scored the lowest total tax rate and Illinois...

Based on input from redistricting experts and political scientists, this resource identifies and ranks the most extreme congressional gerrymanders of the 2020s, examining how map design, cracking, and packing reduce competition and distort representation across states.

Liquids become less viscous as temperature increases, while gases become more viscous and therefore flow more slowly. The increased gas collisions at higher temperatures contribute to greater friction between streamlines, increasing viscosity.

That makes Connecticut the most competitive state in the country when it comes to joining the 1%. This map outlines how much it takes in the other states.

Dive into this collection of stats and infographics explaining the current state of both Hollywood and the global film industry. The page covers a variety of topics, including independent film production, box office revenue, global film markets, movie-going demographics and more. It also addresses the relatively new phenomenon of home video streaming.

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