Coffee contains an average of 15mg of caffeine per fluid ounce

A caffeine calculator

This simple calculator takes your preferred caffeinated drink and your body weight to determine how much is the right amount, and how much might kill you. In case you've ever had the morbid curiosity about just how much of that tea you'd have to drink to doze off forever. Find out your moderate and lethal doses here, as well as some extra info on caffeine consumption.

Up to 400 milligrams of caffeine a day is considered safe

Small, frequent doses can be more effective than large amounts, though caffeine can raise blood pressure and heart rate, especially in people with hypertension. While low doses of caffeine may help with depression by stimulating dopamine, excessive caffeine, particularly from energy drinks, can lead to anxiety and heart issues.

Coffee is, generally, good for your health

While overconsumption certainly has its drawbacks—hello, not sleeping until the sun rises—on the whole, coffee is fine, even beneficial, for your health. It can even help prevent serious health conditions, like heart attacks and liver cancer.

Coffee gives you energy, but it ultimately makes you more tired

The caffeine in coffee delays your brain's fatigue signals. Caffeine blocks adenosine, a compound that builds up as you burn energy and signals rest. Once caffeine wears off, adenosine floods back, leaving you even more tired.

Coffee is made by brewing the seeds from the coffeea plant

The cherries from the coffeea plant are milled into coffee beans. After processing, the beans are dried and roasted.

Understanding the distinctions between coffee types

If you’ve ever felt overwhelmed looking at a coffee shop menu, you're not alone. Here's a breakdown between common coffee styles. Click through the link to see similar guides to espresso and cold drinks.

A cup of coffee on Earth contains about 100 proton masses worth of dark matter

The estimate is based on Earth's location within the Milky Way and the dark matter cloud it resides in. Because scientists do not know the nature of dark matter, the mass may be accounted for with any number of dark matter particles of varying mass.

Civet coffee is some of the most expensive (and bizarre) coffee in the world

Known colloquially as "cat poo coffee," the style is made from beans that have been consumed and then excreted by the Asian palm civet, a small mammal related to the mongoose. Coffee made from these beans is said to be smooth and complex, with notes of chocolate.

Visualize how Coca-Cola's secret formula has changed over time

Coca-Cola contained small amounts of cocaine until the early 1900s—but that's not the only time Coca-Cola has altered its recipe over the years. For instance, Coca-Cola transitioned from cane sugar to high-fructose corn syrup in the 1980s.

Coffee production took off in the 1800s

Coffee production in South America took off in the 1800s, with Brazil establishing itself as the largest global producer in the 1840s. Today, the country grows over one-third of the world's beans and consistently leads in global coffee production, with other Latin American countries like Colombia and Guatemala.

Chocolate can be deadly in humans, but only after consuming extraordinary quantities

Based on tests with mice, the lethal dose of chocolate is estimated to be no more than 1,000 mg/kg. This means that the lethal dose of dark chocolate for the average US adult is about 6.5 kilograms (14.33 pounds), or about 8,300 Hershey's kisses, in one sitting.

Before it was a drink, coffee was used for handwashing

Five centuries before the caffeinated drink was consumed, coffee beans were used for their aromatic quality. One 10th-century text explains how it "obliterates greasy smells of food on hands and whatever of sweets and fats. Whether traveling or at home, neglect not to wash your hands with it."

Bees are more likely to remember a flower if its nectar contains caffeine

Plants want pollinators to keep coming back, so the finding suggests that some plants, such as Citrus and Coffea species, have evolved to include caffeine in their nectar. Researchers suggest the findings could help develop methods to reinvigorate pollinator populations.

Soda is one of the most overpriced items at restaurants

All restaurant food is marked up—that's how they turn profits, after all—but soda is one of the most egregious. Fountain soda is remarkably cheap, with restaurants often paying a few cents for each glass before selling it for a few dollars. Food publication The Takeout estimates that the typical markup is around 1,000%.

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.

See how sugar stacks up against the sweetness of sugar alternatives

This US Food and Drug Administration graphic compares different approved sugar alternatives to give the public a sense of just how intensely sweet these sweeteners are compared to table sugar. Aspartame (NutraSweet and Equal), for example, is 200 times sweeter, Sucralose (Splenda) is 600 times sweeter, and Saccharin (Sweet'N Low) is between 200 and 700 times sweeter.

The health benefits of matcha tea

Matcha tea has skyrocketed in popularity in recent years. Very likely due to its bright green color, which is conducive to social media post aesthetics. The tea is a powdered form of green tea, and its benefits are touted everywhere. This article examines the evidence for such health claims, finding the tea's key nutrients of theanine, chlorophyll, and caffeine did have small observable effects on study participants. Learn more here.

There's a grading room on the eighth floor of the New York Stock Exchange where experts loudly slurp coffee and then spit it out to test its quality

Since many agricultural commodities are traded through futures, testers ensure that the physical product that reaches the market accurately reflects the price. Coffee graders at the NYSE have to pass a four-day-long exam that's only offered every five years and has a less than 10% pass rate.

What's inside an Oreo?

If you look at the ingredient list on your Oreo packaging, you may discover that you don't recognize—or can't even pronounce—some of the listed ingredients, let alone know what they're used for! For instance: Did you know that soy lecithin helps makes oil and water mix? Or that cocoa processed with alkali becomes darker and less acidic? A food scientist breaks down what's inside an Oreo in this seven-minute video.

Supplements often have issues with impurities, toxins, and inaccurate labels

Consumer Reports' tests of more than 20 supplement powders and shakes in 2025 found that more than two-thirds of them contain unsafe levels of lead. Some contained 10 times the amount of lead that's considered acceptable to ingest in a day. The levels they found, in some cases, were even higher than when they tested the products 15 years earlier.

Explaining concentrate and how concentrate-derived juice differs from its source

Developed to reduce the volume of goods—thus lowering storage and shipping costs—the concentration process uses pressure and heat to remove water, pulp, and skin from fruits. Concentrates provide significant flavor, sugar, and calories to foods in small quantities, but do not retain most of the fiber, vitamins, and other nutrients from the source fruit.

Alcohol is responsible for 5% of cancer cases and 4% of cancer deaths in the US

Alcohol consumption is linked to at least eight different types of cancer, including liver, breast, and throat. The risk comes from ethanol, which turns into DNA-damaging acetaldehyde. Experts recommend limiting intake or quitting altogether to reduce long-term health risks.

The average American likely doesn’t notice how many ads they’re targets of per day

The average American is targeted with roughly 5,000 ads each day—but the conscious mind likely isn’t capable of recalling the majority of those. Even still, many consumers have reported ad fatigue due to the near-constant onslaught of ads.

Data centers' electrical needs create increased water demands beyond cooling

Each query uses approximately one single-serving water bottle per conversation, but water is also used for steam cycles and cooling in power plants that generate electricity for data centers. Newer cooling methods, such as immersion cooling, where servers are submerged in fluids that don't conduct electricity, can minimize water use.

Who are America's highest-paid CEOs?

As of 2024, Apple's Tim Cook, Starbucks' Brian Niccol, and Microsoft's Satya Nadella were among America's highest-paid CEOs, each making tens of millions of dollars per year.

97% of Americans polled say they like or love ice cream

The poll—conducted by the International Dairy Foods Association and Morning Consult—asked over 2,200 American adults. The top flavor for Americans? Vanilla.

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.

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

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.

The boiling temperature of water decreases with increasing elevation because the molecules need less energy to overcome the lower atmospheric pressure associated with thinner air.

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 most expensive ad of all time was for Chanel No. 5 perfume and cost roughly $33M to produce in 2004—about $57M in today's dollars.

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

Studies suggest when you sleep is as important as how much you get, and syncing with your circadian rhythms may lead to less fatigue and improved long-term health outcomes

Larger animals like giraffes, elephants, and blue whales have developed a unique defense against cancer, a phenomenon known as Peto's Paradox

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

Memecoins are a type of cryptocurrency—a form of digital currency with a wide variety of uses—created around popular 'memes,' or viral internet jokes.

Scientists testing how climate change affects plants found, in a years-long simulation study, that poison ivy grew 70% faster with the resulting extra carbon dioxide.

Against his wishes, Albert Einstein's brain was removed before his cremation, and the pathologist responsible stored it for decades in mason jars within a beer cooler.

Use this calculator to find the dollar value of your mental load, from meal planning to coordinating after-school care for your children.

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

Waves off the coast of Nazaré, Portugal, can reach over 100 feet and are caused by the area's deep underwater canyon geography

Sunflowers have long been a symbol of nuclear disarmament because they can extract large amounts of radioactive cesium from soil.

Explore fun facts from the USPS, including unique post office buildings, a stamp that traveled past Pluto, and more.

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

Lesser-known phobias include turophobia, or the fear of cheese, and nomophobia, the fear of being without your cell phone.

A small portion of The Winstons' 'Amen, Brother,' an obscure '60s gospel record, is the basis for thousands of hip-hop tracks, making it one of the most sampled records ever that's informally known as 'the Amen break.'

See how Budweiser's famous Clydesdales spend their days at Warm Springs Ranch, where roughly 70 to 80 of the beer brand's giant horses can be found at any given time.

Massive 3D printers have been used to build homes by stacking layers of 'concrete toothpaste,' a fire-resistant material that effectively insulates against outside noise.

An Ebola vaccine was developed during the 2018 west African Ebola outbreak, but the 2026 Ebola outbreak is with a different species of the virus, not the one that the vaccine is approved to treat.