Gold's electrical conductivity, reflectivity, and catalytic capabilities make it scientifically valuable

Gold has no nutritional value or flavor—but edible gold is still popular

Gold is a pretty expensive topping. Nonetheless, luxury menus around the world are offering food staples—think bagels, chocolate, and burgers—wrapped or dusted with gold. What's the deal with this fascination?

A gold standard is a system where every dollar in circulation can be exchanged for a set amount of gold

For centuries, the things people used as money had intrinsic value, such as precious metals like gold. In medieval Italy, giant wheels of parmesan cheese were once used as a store of value.

At the Large Hadron Collider, scientists have transformed lead into gold—a process known as chrysopoeia, which alchemists sought for centuries.

All of the world's gold, visualized

Out of the total above-ground stock of gold (weighing roughly 216,265 metric tons), the largest share is found in jewelry (97,149 metric tons).

Many bitcoin enthusiasts have compared the cryptocurrency to digital gold

Gold is valued for its stability and reliability, serving as a hedge against inflation and economic uncertainty. Bitcoin shares both of these characteristics, but also provides near-instant liquidity and isn’t subject to government regulation.

Why it's so hard to end the use of toxic lead

Lead was one of the earliest metals mined on Earth, desired for its soft malleability and used in cosmetics, pipework, gasoline, and more. But even though researchers demonstrated its toxicity in the 20th century, much of the world still uses it.

Arguments for returning to a gold standard reappear from time to time

However, critics argue that globalization has made the gold standard impractical for modern economies, as it limits a nation’s ability to have a flexible monetary policy—hence, none of today's governments have a gold standard.

Earth's core is leaking precious metals, including gold

Earth's core, containing 99.999% of all known gold, is leaking trace amounts of precious metals into the mantle. Advanced isotopic methods have detected this leakage at volcanoes in Hawai'i, providing new insights into the movement of material beneath Earth's surface.

As of 2024, about 77% of the world's gold reserves have been mined

About 216 million metric tons—about 0.4% of the Great Pyramid of Giza's volume—have been extracted and used primarily for jewelry. The remaining reserves are estimated based on chemical analysis of rock samples extrapolated to the entire mass of Earth's crust.

The history of chemistry up to World War I, from alchemists seeking gold to probing atomic structure

Those involved in the predecessor of the modern scientific discipline engaged in experimentation to develop recipes that would transform ordinary matter into gold and to create medicines, cosmetics, dyes, and alloys. Over the course of centuries, scientists identified unique elements, organized them based on their properties in the periodic table, and eventually developed the technology to discover the internal structure of atoms.

Clean energy technologies are more mineral-intensive than burning fossil fuels

Solar panels use silver due to its high conductivity, hydropower plants use chromium in their steel alloys, and geothermal plants need titanium to withstand abundant heat and pressure. Lithium—used in energy storage—is expected to see over 500% increased demand from 2020 to 2025.

Watch how metals are extracted from rechargeable devices during recycling

Recyclable batteries found in cars, phones, power tools, and other electronics contain lithium, cobalt, nickel, and other precious metals, whose reuse generates 70% fewer emissions than during their initial mining. Upon shredding these devices, a filter press squeezes the pieces through a proprietary fluid, which separates them for future reuse.

The applications and industrial uses of graphene, the single-atom-thick material

Shortly after its discovery in 2004, the strength, flexibility, optical properties, and conductivity of this thin layer of carbon atoms earned it the designation of a "wonder material," but breakthroughs in its use have taken decades of research. As of 2026, graphene-enhanced electronic sensors, optical microchips, concrete, and supercapacitors are available, though scale production challenges remain.

Several birthstones play key roles across modern technologies

Diamonds are used in drills and quantum computing, while peridot and zircon help in steelmaking and carbon capture. Rubies, sapphires, and alexandrite enable several varieties of lasers found in medicine and advanced optics. Garnets are found in water filtration systems and radiation detectors. Sapphires are used as substrates in semiconductors.

A gold standard is a system in which a country’s currency is pegged to, and can be converted into, a fixed amount of gold

In principle, this provides price stability as the amount of gold (and therefore the value of the currency) is limited, but also restricts the ability to modulate the money supply during economic downturns.

How goldfish cause significant environmental damage when released

Researchers have found that goldfish cause "regime shifts" in habitats as they search for food in places like lake beds, kicking up sediment that muddies the water and disrupts small invertebrates. They can also outcompete native species to further destabilize existing food webs.

Similarities in reactivity complicate separating rare earths from ores

The proximity of these elements in the periodic table mean they have similar electron structure and require complex separation processes during processing. However, their uncommon magnetic, luminescent, and electrical properties make them invaluable for critical industrial applications.

Graphite is a powerful conductor and heat-resistant material

Graphite can withstand temperatures of more than 3,000 degrees Celsius, allowing it to contain molten metal in steel production. Rosalind Franklin identified which carbon compounds become graphite and laid the groundwork for their use in industrial applications.

View the five most expensive metals used to make batteries

Before 2021, when lithium carbonate became the most expensive metal for use in electric vehicle cathodes, cobalt was the most costly battery metal. Of the top five, copper is the only metal not used in cathodes, arguably the most important part of the battery, which determines performance, longevity, and range.

22 fascinating discoveries of massive gold coin hoards

The gallery highlights major gold coin treasures from ancient to modern times, from the Saddle Ridge hoard in California in the 1800s (now worth $10M) to finds in Baltimore, Kentucky, and more. Each discovery reveals something about the period, with some buried and others left in vaults.

The value of a 400 oz gold bar hit $1M for the first time in 2024

On Aug. 16, 2024, the gold bar size often seen in movies hit $1M in value for the first time when the price of gold reached $2,500 per troy ounce. A data visualization shows what other gold bar sizes are worth and compares them to the size of an iPhone.

American Express was the first company to offer 'gold' cards to borrowers

American Express began offering gold cards to affluent consumers in 1966. However, other credit card companies began offering similar, premium cards in the 1980s, which quickly became a status symbol for wealthy Americans.

Metallic hydrogen exists in Jupiter and Saturn due to high pressure and temperature

This state of hydrogen has metallic properties, including conductivity, which powers these planets' magnetic fields. First theorized in the 1930s, its existence was confirmed through indirect evidence before being created in a Harvard lab in 2017.

A ‘gold bug’ is a person who is bullish on gold as an investment

"Gold bugs" often argue that fiat money allows governments to engage in financially reckless behavior (think: chronic borrowing). They also say the price of gold rises as the value of fiat currency falls.

Genetically modified viruses can help construct battery electrodes

MIT scientists' modifications caused the viruses to attract conductive materials, such as gold ions, which the viruses self-assembled into nanowires that could be used in batteries. These components allow batteries to be thinner and flexible enough to be constructed into new shapes.

Gustav Klimt featured a lot of gold leaf in his art

Austrian artist Gustav Klimt's most iconic image, "The Kiss," can be seen today printed on tapestries, t-shirts, mugs, and more. The painting comes from a decade in his career where gold held a prominent place. Klimt's family business of goldsmithing, in tandem with inspiration from Byzantine churches, coalesced in his obsession with gold.

The outermost shell of electrons in an atom dictates how it bonds to other atoms, including those of the same element, and the properties of the materials composed of those atoms.

Beyond critical minerals, copper is emerging as a bottleneck to clean energy

Copper remains invaluable for the transmission of electricity needed in energy infrastructure projects, with 90% of the average circuit board made of the element. However, limited smelting capacity and low ore quality amid increasing demands are stressing global supplies.

The history of metallurgy: an interactive timeline

Humans have long been shaping metals into useful tools and aesthetic accessories. By 8,700 BCE, humans already had mastered four types of casting copper. Within a few thousand years, people were combining metals to make the alloy bronze and had...

Cryptocurrency acts as a store of value

Traditional money, dating back to its first known uses in ancient Babylonia, has many uses—it reduces friction in transactions by providing a common denominator of value (unit of account), acts as a single item accepted by many vendors (medium of exchange), and holds wealth as a store of value.

Explore an interactive database of critical minerals and their uses

Columbia University's Critical Materials Monitor identifies 56 elements required for the clean energy transition. The tool provides details on the reserves, production, and trade of each element, alongside what materials are needed for each technology (desktop only).

View the most expensive materials on Earth, led by antimatter and other elements forged in particle accelerators.

Fort Knox was originally built to be a secure facility for the US Treasury's gold reserves back when the US still operated under the gold standard, a system in which a country's currency is pegged to, and can be converted into, a fixed amount of gold.

An overview of the metals obtainable through deep-sea mining of nodules and crusts

Polymetallic nodules are a source of manganese, cobalt, nickel, copper, molybdenum, and platinum, which are used in batteries, fuel cells, and metal alloys of electric vehicles. Seamount crusts contain rare-earth elements deemed essential to US national and economic security, including neodymium and dysprosium used to make permanent magnets.

Explore an interactive periodic table of each element's history, properties, and uses.

When did people start making and using glass?

This article details the search for the ancient origins of glass, a now-common item through which archaeologists can spot histories of trade and innovation. Bronze Age glass was made from crushed quartz instead of sand, and artisans could color glass with materials such as cobalt. These trace metallic add-ons have given scientists a vital clue into the origins of glass, which is currently debated as either Egypt or the Near East.

Bullion is either gold or silver that has at least 99.5% or 99.9% purity, respectively

It’s typically kept in the form of bars or ingots. Governments and central banks often keep bullion reserves on hand; they can use it as a hedge against inflation. One can invest in bullion via ETFs, among other financial vehicles.

Learn about the applications of radioactivity in medical, academic, and industrial settings

Besides their use for radiometric dating by archaeologists and researchers at museums and universities, radioactive materials are used in sensors that help track ocean currents and analyze pollution, soil, and petroleum products. Radioisotope-based sensors also help measure air in ice cream and prevent spillovers when soda bottles are filled in factories.

Chromium contaminants in a ruby crystal gave the world's first laser its red color

The red light originates from a long-lasting excited electron state in the element's atomic structure. The brittle gray metal has historically been used in pigment production, the manufacturing of rust-resistant stainless steel, and the creation of durable coatings with long-lasting shine for metals, wood, and leather.

Some synthetic diamonds are purposely made with defects for new technologies

Grown in plasma-filled chambers or reactors where pressures reach 800,000 pounds per square inch, diamonds can develop properties like electrical conductivity and magnetic field sensitivity through exposure to elemental impurities or removal of some of their carbon atoms.

Legacy electronics have prevented significant advancements in alkaline batteries

While lithium-ion batteries have increased in energy density multiple times since their commercialization in 1991 and can be sized to various capacities by connecting numerous electrochemical cells, disposable alkaline batteries have been forced to maintain their 1.5-volt standard and form factors for compatibility with existing devices.

Although they rely on radioactive elements to operate, everyday technologies such as electronic exit signs, some wristwatches, and smoke detectors are not dangerous, unless they are damaged and their radioactive material is inhaled or swallowed.

The mysterious Fort Knox houses much of America’s gold reserves

This fortified vault, built in 1936, is part of the US Mint, but it doesn’t create any currency. Only a presidential order can open Fort Knox—there has not been an audit of its contents since 1953.

Costco's bullion program offers an attractive option for retail investors, experts say

Although Costco's gold bars often sell out, experts caution that the Costco gold rush was more "mob mentality" than sound investment. The bullion program is one way for retail investors to get exposure to the commodities market.

Ernest Rutherford's gold foil and nitrogen experiments revealed nuclear structure

Observing high-angle deflections when alpha particles were fired at gold foil led to an atomic model with a dense, positively charged nucleus. Firing those particles at nitrogen resulted in the emission of hydrogen nuclei—protons—leading to the discovery of the subatomic particle.

Fiat money is a currency with no intrinsic, tangible value

Unlike the gold standard, where a nation's currency is linked to the value of gold, fiat money gets its power from the public's trust in its value.

4-minute overview of gold mining in the Amazon rainforest

A 2022 NBC news investigation of gold mining in the Peruvian Amazon rainforest. Much of the $3B in illegal gold is trafficked to the US every year.

The adaptations of metallophiles and how they can be harnessed for bioremediation

These extremophiles have adapted to biomes with very high concentrations of metals and toxic chemicals by developing mechanisms to isolate these substances within cellular compartments and break them down into less harmful forms with specialized proteins. They have the potential to support the decontamination of metal-rich wastewater and soil, as well as the extraction of rare-earth metals.

A smartphone contains over a dozen rare earth elements

One of the most important elements is indium, which makes up an electrically-conductive mesh beneath the display that provides touchscreen functionality. Alloys containing REEs are used in the magnets needed for the microphone and speaker.

Plastic's history began with an inventor seeking a $10,000 prize offer

In 1869, the first synthetic polymer—celluloid—was created as a substitute for ivory in billiard balls. It became the historical catalyst for the eventual manufacturing of plastics everywhere as an alternative to the depletion of other natural resources, including tortoiseshell and horns.