Solana is a blockchain designed for fast, scalable, low-cost transactions

Decentralized applications are blockchain-based and run without a central authority

These apps use smart contracts to automatically execute functions, ensuring security, transparency, and censorship resistance. Built on platforms like Ethereum, Solana, and Binance Smart Chain, DApps power DeFi, NFTs, gaming, and social media, offering users control over their data and assets.

Proof-of-work versus proof-of-stake: what's the difference?

The two main consensus mechanisms—the way blockchains confirm and enshrine information—are proof-of-stake and proof-of-work. An overview compares the differences between the two and the latter's ability to reduce the energy intensity of the computation process, which has emerged as one of the biggest criticisms of the crypto boom.

The blockchain offers tantalizing possibilities for future use

Think of blockchains as a running list of information, where new details are added to the running chain as discrete "blocks." With crypto, the information contained within each block could be virtually anything, providing flexibility for uses in commerce, legal filings, healthcare records, and more.

How to stake Ethereum

Ethereum switched to a proof-of-stake method for validating transactions in recent years, and now investors can stake 32 ether to participate and earn rewards. Several ways to get involved in ether staking exist, with varying levels of income, difficulty, and impact. Some allow users to stake less than 32 ether by pooling funds with other users, while others require less advanced hardware. Read about the different staking methods here.

Memecoins are cryptocurrency created around popular 'memes,' or viral internet jokes

Dogecoin is perhaps the most famous "memecoin." While they tend to be more volatile than other types of crypto (after all, they're often created due to ephemeral trends), that doesn't mean they can't be valuable: Dogecoin is currently one of the most valuable cryptocurrencies in the world.

Smart contracts are the foundational technology behind NFTs

Smart contracts use “if that, then this” logic to track the ownership of NFTs and record when they are bought and sold on the blockchain.

Stablecoins now transfer more value than Visa or Mastercard.

Because stablecoins operate on public blockchains, transfers can occur nearly instantly without intermediaries, unlike traditional credit card networks. This has fueled stablecoins' adoption within the crypto world and in cross-border payments. Stablecoin transfer volume rose from about $3B in 2018 to roughly $18T in 2024, overtaking Visa's roughly $16T and Mastercard's $10T.

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.

As of 2025, an estimated $3.2B in annual revenue flows through dark web platforms

The untraceable cryptocurrency Monero is used in about 60% of transactions across more than 37 active marketplaces that sell copyrighted materials, private information, and phishing kits—tools that help bad actors more easily create fake sites to steal users' data—for financial fraud.

What does the surge phase mean for Ethereum?

The Surge is the next major upgrade for Ethereum. It’s a process aiming to scale up Ethereum, letting it handle more transactions, more efficiently. A key part of this process involves “layer 2 rollups,” which bundle transactions in part of the blockchain to process them more quickly. The Surge is expected to improve Ethereum’s decentralization and lower gas fees. Learn more in this article.

The payments tool Zelle was created by big banks to compete with apps like Venmo

Zelle is an alternative to Venmo, where people can pay each other back for expenses like apartment utilities or dinner. But its origin story has more to do with big finance than small transactions.

Bitcoin mining validates/adds bitcoin transactions onto the blockchain

Mining, done by a decentralized network of actors, is incredibly energy intensive, making the award of bitcoins a major incentive.

A letter to Ethereum’s community from an early builder

Fuel Network CEO Nick Dodson writes about his experience as an early app builder on the Ethereum blockchain. He talks about why he perceives Ethereum as being different from rival blockchains like Solana, espousing the ethos and “spirit” of the Ethereum network and community. At the same time, he lays out some hopes he has for the future of Ethereum in a telling peek into an Ethereum insider’s brain. Read the letter here.

What is the Fediverse?

The "fediverse" is a league of like-minded apps looking to make our digital identities—including posts, followers, activity—move seamlessly between networks. It's a decentralized approach, making various social networks interoperable in contrast to Facebook and Twitter, where content is platform-specific. The fediverse provides stability and control to users. Learn more here.

Lithium-ion batteries are the standard for rechargeable devices

The costly setup of new mining operations and challenges with recycling amid growing demand have led researchers to search for alternatives, including sodium-ion, solid-state, and lithium-sulphur batteries, despite challenges with scalability.

Solar sails use light as a means of propulsion

Photons possess momentum and can transfer it to objects they strike or bounce off, imparting radiative pressure, or a light-based force over a small surface area. Lasers fired at observational equipment with specially designed sails can theoretically use this mechanism to accelerate up to 20% the speed of light.

Kalshi is the first regulated prediction market in the US

Two migrant MIT students, Luana Lara Lopes and Tarek Mansour, shared an interest in hedging against uncertainty—from election outcomes to the Oscar awards. They fought hard for regulatory approval and their company now has a valuation in the billions. The platform has brought prediction markets into the mainstream.

NFTs can be used for fractionalized ownership of assets

Non-fungible token is a term used to describe a unique digital asset whose ownership is tracked on a blockchain, such as Ethereum.

The interoperable metaverse and what that means

This explainer video explores the challenges of achieving the interoperability needed to unify economies, avatars and systems across virtual worlds in the metaverse.

What is a smart city?

The internet of things and automation are two of the technologies used in smart cities. Learn about the technologies making cities more human-centric in this three-minute read.

Bluesky is gaining momentum by offering users full control over their experience

Controversial changes made by Elon Musk to X have inspired an exodus from that platform and growth in Bluesky. The latter's open-source model gives users customizable feeds, portability between services, and a "billionaire-proof" design that prevents corporate takeover.

How hash functions encrypt stored passwords and can be enhanced with 'salt'

Hash functions convert text into unique, random sets of characters, a process that is computationally expensive and time-consuming to undo. Because hashed outputs for many common passwords are publicly listed, some sites use a salt—additional characters appended to a password—before hashing to produce an output that is not known. When entering a password, it is salted and hashed, then checked against the database for a matching hash before permitting login.

SPACs, explained

Special purpose acquisition companies make it easy for mature unicorns (companies valued at over $1B) to receive growth capital by going public. This process effectively skips the work of a traditional initial public offering, and its time-intensive investor negotiations. Typically, a well-known investor with expertise in a certain industry sponsors a SPAC with the intent to acquire a startup. Learn how it works and the risks involved here.

Cryptocurrency wallets for beginners

Cryptocurrency wallets come in many types. Here, we present the details, comparing the wallets’ features so that you can choose the best crypto wallet for your needs.

The history of Solvang, California's little Danish village

Just north of Santa Barbara sits a curious California gem: Solvang, a small town constructed in the Danish Provincial style. This video tour of the village provides a fascinating history of how the town became a miniature Copenhagen and does so in a unique way: by trying to recreate vintage photographs of the town. It makes for an entertaining and educational tour.

The cloud relies on hardware infrastructure with real-world limits

While unlimited storage providers exist, this does not mean online storage is limitless, as it relies on servers, cables, power, and physical space, all of which are finite. However, the cloud seems infinite because the number of servers and data centers built outpaces demand. Storage solutions are also routinely replaced with more efficient options.

SpaceX's S-1 or 'prospectus' revealed many previously unknown details about the company, including its unprofitability despite doing $18.7B in revenue in 2025, exactly how many voting shares Elon Musk will have in the company (roughly 85%), and more.

The US dollar is the most widely circulated currency in the world, and is involved in nearly 90% of global transactions

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.

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

How fusion—which releases energy when two lighter atoms combine to form a heavier atom—differs from fission

While the sun's gravity keeps the planets in orbit, their gravity also pulls on the sun, causing it and everything else in the solar system to orbit around a mutual balance point called the barycenter—the true center of the solar system.

Watch how algorithms can be designed to train themselves and self-improve without human input, to the point where the optimized code is too complex for programmers to understand.

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

The name 'Silicon Valley' arose from the founding of Shockley Semiconductor Laboratory in Fairchild Semiconductor in 1956-57, founded near Stanford University in Palo Alto

Watch how deep-sea mining equipment collects and processes polymetallic nodules—metal-rich, potato-shaped rocks—from the ocean floor and creates environmentally damaging plumes of sediments.

Pure water does not conduct electricity because this flow of energy requires the movement of charged particles, and water is a neutral molecule.

Electrical grids worldwide must double their power delivery capacity by 2050 to meet surging demand from AI and electric vehicles.

Telehealth demand for GLP-1s for weight loss is booming as consumers seek easier access.

US housing costs have risen by roughly 175% between 1991 and 2026—but a growing number of Gen Zers are becoming homeowners anyway. In 2025, 4% of homebuyers were Gen Z, up from 3% the year before.

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

Shooting stars, or meteors, are fragments of asteroids and comets that burn up as they enter Earth's atmosphere, creating streaks in the sky called meteor showers.

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

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

The syncytiotrophoblast is the outer layer of the placenta and the largest human cell, spanning an area about twice that of a king-sized bedsheet.

'Silent' fireworks have gained more interest in recent years as a quieter celebratory option.

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.

The deadliest aspect of volcanic eruptions is often not lava, but pyroclastic flows—avalanches of ash, gas, and rock that can move more than half the speed of sound.

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by over 1.5 million Muslims.