Why the Scoville scale for measuring a pepper's heat is outdated and inadequate for sauces

Over time, people develop a resistance to spicy foods

TRPV1 is a receptor in the body that detects potentially harmful things and responds in a variety of ways, including sweating, tearing up or a runny nose. Over time, more exposure to spicy foods can build up a resistance that minimizes these reactions.

Explaining why salt should be used to season food early in the cooking process

Experiments involving the same dishes, with salt added at the start of cooking versus at the end, have been shown to yield drastically different taste outcomes because salt takes time to diffuse into foods, particularly vegetables, whose cells are surrounded by cellular membranes and walls. Salting at the end will produce a concentrated surface coating, rather than even seasoning.

Ketchup, 101

Ketchup is a tomato-based condiment mixed with vinegar, salt, and spices. The word likely originates from Southeast Asia, where it was used for a common fish brine sauce in the 18th century. For a brief period in the early 19th century, ketchup was viewed and marketed as a medicine. Henry John Heinz formulated a standard recipe in the late 1800s.

Play food science trivia along with a former state trivia champion

From limitations in panda taste receptors and a surprising food that has been forged into diamonds to the origins of chili pepper heat and the Maillard reaction, test your knowledge during a game of Super Food Science Excellence Trivia Blowout.

How science came to understand umami

Before Dr. Kikunae Ikeda sat down in 1907 and pondered the taste of dashi, scientists typically agreed upon four types of taste: sweet, salty, bitter, and sour. He boiled 90 pounds of kelp into a resin that he then stripped of different compounds until he was left with a single ounce of brown crystals. Testing later revealed these crystals were glutamate, an amino acid and one of the protein's building blocks.

How 'vibes' factor into scientists' decisions about using certain units

Although there are absolute quantities from which units can be defined, such as the speed of light and the corresponding light year for distance, the usefulness of units comes from their ability to easily communicate values, rather than how fundamental their origins are. For example, while Kelvin measures absolute temperature, Celsius is scaled to the temperatures of boiling and freezing water, making them more practical for everyday usage.

Humans may be able to distinguish more than one trillion scents

That's according to one estimate published in 2014. This figure far exceeds earlier estimates of a human smelling ceiling around 10,000 odors. The newer figure is derived from experiments in which volunteers agreed to sniff varying scents. Researchers mixed odor components and had volunteers sniff the brews to detect subtle scent differences. (Some users may experience a paywall.)

How our sense of taste evolves as we age

Kids are hardwired to prefer sweets over greens, with sweetness a shorthand for calorie-rich and bitter flavor warning of potentially noxious plants. This holds true even in the womb, where fetuses have been seen via ultrasound scans grimacing as their hosts consume kale capsules. As they age into double digits and beyond, their taste cells and sense of smell diminish, leading to broader and less sensitive palates.

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

Listen to how the 1902 'poison squad' experiments changed food safety in America

As part of government research, a group of young men were paid to eat standard American food—replete with food additives like borax and formaldehyde—which revealed the dangers of unregulated food. The work was led by the first FDA commissioner, Harvey Wiley, who helped end the "century of the great stomachache."

The preferred barbecue sauce depends on your location

America's regional barbecue styles include multiple highly specific sauces. From the tart, acidic vinegar-based sauces of North Carolina, to the thick, sweet-spicy Kansas City variation, American barbecue sauces are as varied as the country’s geography.

The idea of a tongue map has been discredited (but taste sensitivity varies across the tongue)

The original tongue map, created by German researcher DP Hanig, recorded taste sensitivities reported in psychological studies. His findings were later translated and taken out of context, possibly giving rise to the faulty tongue map. In fact, taste receptors in the oral cavity respond to all tastes regardless of their location.

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.

Some critics say comparing chart rankings across decades is meaningless

Although Billboard’s charts are presented as objective measures of a given song’s popularity, the company’s changing methodology (alongside changes in technology and listener habits) has made weighing chart success from different eras an imperfect science.

The Richter scale was only intended to quantify Southern California earthquakes

The scale, designed to rate the energy of the largest seismic waves released by an earthquake, was calibrated to the region’s crust and mantle properties. Since the 1970s, seismologists have instead used the moment magnitude scale, which considers all waves of released energy.

Why Smartfood cheddar popcorn lost its flavor

A passionate fan of Smartfood's white cheddar popcorn investigates why the snack's flavor has diminished over the years. After consulting online forums, the author confirmed many fans noticed the shift. The inquiry revealed a major change to the ingredient list between 2019 and 2021, where cheddar cheese was downgraded and "natural flavors" upgraded—likely due to regulations around sodium use in snacks. Read for a fascinating overview of snack formulas, corporate marketing, and more.

There's no definitive test for inflammation, or a baseline for what's considered normal

Existing tests can pick up proteins that indicate an immune response—in particular C-reactive protein, which the liver produces when the body's stressed—but that won't tell you why there's inflammation nor if it's chronic or acute inflammation. (Some users may experience a paywall.)

The three-star system arrived in 1931

In the 1920s, the Michelin brothers employed anonymous inspectors to review restaurants in their guides. Inspired by other popular European guidebooks, they added the Michelin Star in 1926 to mark the best restaurants in France. In 1931, it was expanded to the current system of up to three stars.

The term 'superfood' is a marketing construct with no scientific or medical definition

Encompassing at least 136 plants and animals, the concept has been criticized by nutritionists for its scientific value, which has been exploited by the wellness industry for profit. Although the label has encouraged the consumption of fruits and vegetables, food variety and minimal processing remain key to a healthy diet.

One writer suggests using the California roll to evaluate sushi restaurants

Christine Carone uses the logic of the Big Mac Index—a metric for evaluating purchasing power by comparing countries’ Big Mac prices proposed by the Economist—for evaluating takeout sushi. Her recommendation is looking at the cost of a California roll, a relatively inexpensive, middle-of-the-road item for any American sushi spot. If it’s too expensive, the restaurant isn’t offering good value. But if it’s too cheap, you should worry about the quality of the fish.

The microplane zester, mortar and pestle, and other underrated kitchen tools

Eight chefs weigh in on the most helpful culinary tools they often don't see in people's kitchens. The very specific fish fork, for example, not only delicately moves fragile filets but can double as an olive or soft cheese server.

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.

Acrylamide forms naturally during high-heat cooking through the Maillard reaction

While studies have shown it can damage DNA and potentially cause cancer in mice, humans absorb and metabolize acrylamide at different rates, introducing uncertainty in the research's applicability to humans. Some international health agencies have nonetheless recommended avoiding darker roasts when cooking starchy foods.

Before the S&P 500 launched in 1957, Standard and Poor's had a daily index with just 90 companies

Unlike previous indexes from S&P, the S&P 500 could be computed in real time using computer technology that tracked stock tickers across stock exchanges. This innovation is partly what led to 500 companies being listed on the index, a huge increase from the 90 companies in S&P's flagship index when the company had to do all the analysis by hand.

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.

A Death Valley shrub optimizes its cells' organelles to photosynthesize in extreme heat

Examining the cellular structure of the plant under heat, scientists observed the formation of novel, cup-shaped chloroplasts and mitochondrial relocation, which shifted the plant's optimal photosynthesis temperature to 45 degrees Celsius (113 degrees Fahrenheit) as it tripled in mass over 10 days. Engineering these mechanisms in crops may help optimize them for hotter environments.

This is not a chip

Pringles aren’t chips—legally speaking. In the US, the FDA said they’re not potato chips. In the UK, courts ruled they’re not even crisps. Turns out, being 42% potato creates a lot of legal confusion. So what are they, really?

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

Listen to an in-depth conversation on the links between Parkinson's disease and herbicide exposure and the challenging pace of scientific investigation.

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.

How the most famous Ebola book, The Hot Zone, which sold 3.5 million copies and was translated into 30 languages, got aspects of the disease so wrong.

Fast-casual restaurant Chili's is experiencing a resurgence, with its parent company recently reporting a nearly 32% increase in sales, thanks to passionate Gen Z fans on TikTok.

The power and influence of the American presidency have expanded significantly over time—far beyond what the founders envisioned.

US intelligence allegedly pursued more than 600 schemes to assassinate Cuban revolutionary Fidel Castro.

Hear 50 years of iconic hip-hop samples, the genre's foundational looped tracks

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

Recent research found that the brain doesn't seem to massively rewire following amputation—upending earlier beliefs about the cause of phantom limb pain.

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.

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

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

Fear or disgust related to clusters of holes and cracks, called trypophobia, may stem from evolutionary processes to help us avoid pathogens.

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.

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.

Explore our favorite visualization of the immense scale of space, from an astronaut to the size of the observable universe

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

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

Prince's sexually explicit 1984 track 'Darling Nikki' attracted the ire of the Parents Music Resource Center, an advocacy group that inspired the Parental Advisory sticker, even though the song ends with a Christian message.

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.

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

Frank Lloyd Wright's houses are historically hard to sell because they're old, subject to local landmark commissions, and often unfashionable