How companies track you around the internet, explained

Ads follow you around the internet through cookies

A technology called “cookies” enables advertisers to essentially team up and follow your behavior around on the internet. This video explains why it seems like ads seem to follow you as you go from website to website—as well as data privacy advocates’ war against cookies.

What we learned about Google

Google processes over 8.5 billion searches every day—more than the number of people on Earth. This short breakdown covers how the company evolved from a Stanford research project into a global tech leader, with products like YouTube, Gmail, and Android reaching billions worldwide.

Explore internet usage data, including how humans consume 1.2 billion years of content yearly

About half this time consists of content from social media platforms, where the average user spends about 18.5 hours weekly. An estimated $3.66T was spent on consumer goods by online shoppers in 2025, though nonconsumer goods, such as flights and hotel stays, greatly increase this estimate.

Data privacy advocates worry that Google collects too much personal information

Politicians have also criticized whether the search engine exerts too much control over gatekeeping online information and influencing what is considered fact or fiction, deviating from its original corporate motto of "don't be evil."

How Google Street View generates profit

Google Maps, one of the most trusted navigation applications today, has a somewhat mysterious way of making a profit. YouTuber Phil Edwards uncovers the secret economic practices of Google Street View, while also offering a deeper understanding of how it works.

See the original websites for companies like Google, Facebook, and Apple

Explore archived images of homepages on websites dating all the way back to 1991.

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.

Explore metrics on the Tor network, the infrastructure of the dark web

While internet traffic within the network is concealed, public, nonsensitive data can be used to estimate the number of active users, the number of relay servers, network performance speed and reliability, etc. Researchers can use this data to indirectly identify political upheavals or censorship campaigns worldwide, such as the Arab Spring.

Why TikTok's algorithm is likely driven by what you linger on

While the inner workings of the engine driving the vast majority of the app's engagement remain a secret, it is understood to rely heavily on what content users spend the most time watching rather than swipe past. Experts believe the app can develop user profiles robust enough for its algorithm to consistently match engaging content to in as little as two hours.

Interactive charts on human rights around the world

This website provides comprehensive data visualizations tracking human rights around the globe. While human rights have become much more protected, this varies between countries. Users can find information on how the protection of human rights has...

Humans can track smells on the ground quite well—our ability to crawl is a limiting factor

As part of a scientific bet, neurobiology researchers dragged a chocolate bar across the grass and sought to see if a human could track it—she could. This led to a more in-depth experiment on human olfactory capabilities and behavior when other senses were blocked.

How political campaigns use your data

What do campaigns know about US voters, and how do they use that information to shape their strategies during elections? US political campaigns base their strategies and tactics on data collected from more than 200 million voting-age Americans. This visualization by Reuters breaks down how data firms create national databases of voter files, collecting information from a variety of sources to create detailed voter profiles and how political campaigns use that data.

Brain wave-reading earbuds are being used by companies to study workplace performance

Limited safeguards prevent governments from accessing and companies from sharing brain data. Foreign governments may also be developing technology to spy on and potentially disrupt human thoughts.

When you complete a CAPTCHA on a website to prove you are human, you may be unknowingly training algorithms for self-driving cars, whose systems require training data to help identify crosswalks, bicycles, and other outdoor objects.

Activity trackers promise to improve health by forcing us to examine the facts

Explore how modern fitness culture, rooted in capitalist ideals of productivity and control, shapes our perception of health and self-worth. The author blends cultural criticism with personal insight to examine the contradictions of the wellness industry, the rise of wearable tech, and what it means to "optimize" a body.

Understanding the causes, effects, and prevalence of algorithmic bias

Found in search engines, hiring and college admissions tools, facial recognition systems, and other software, algorithms act on the rules they are programmed with, which may be authored by individuals unaware of their own biases. Algorithms based on limited, incomplete, or inaccurate data are more likely to inherit and propagate existing biases.

Many startups now have shoes-off policies

This website keeps track of startups with "no-shoes" offices so you can browse a list of barefoot companies—plus, see which of them are hiring.

Track individual sharks around the world in real time

OCEARCH provides essential data on shark populations and marine ecosystems to support broader conservation efforts. Foster your understanding of marine ecosystems by exploring different species and their movement.

Explore an interactive map showing what makes people happy

Using 10,000 responses collected from people around the world about what makes them happy, this map offers insights into how relationships, finances, purpose, and small treats all contribute to a person's contentment. Recent data suggests that young people today are less happy than those in previous generations, indicating a need to reflect on what really matters in life.

The future of the internet

Blockchain? Crypto? NFTs? Oh my. Gilles DC provides a simple breakdown of what Web3 is, what it involves, its connection with web currencies, and how you can begin your own explorations of this brave new world. Gilles promises to describe Web3 in one take, explain how the reader can take advantage of it, and how blockchain might build a better society as a result.

See how much key commodities are trading for in real time

This tracker shows the current price of common commodities such as crude oil, lumber, nickel, and many more, as well as how much these prices have fluctuated over the past day, year, week, and month.

20 of the most common cyberattacks

While there are dozens of different types of cyber attacks, this article explains the top 20 most common network attack examples, including phishing, whale-phishing, and spear-phishing attacks. Learn how to best protect yourself.

The major AI industry players are creating a web of circular investments

Bloomberg created a network diagram that shows how companies like Nvidia and OpenAI are fueling the AI money machine. The chart shows that many top AI companies provide significant investments to one another.

The 'Where's George?' project tracked a trail of $1 bills across the US

Over a decade ago, a group dedicated its time to tracking $1 bills in the US. They would stamp single bills with the phrases “currency tracking project” and “Track me at WheresGeorge.com” in a practice they dubbed “Georging.”

Find 36 hidden messages in these household name company logos

Brand logos are designed to represent a business's core values and products in a unique, differentiating way. We experience this branding mechanism regularly, and hundreds of businesses are recognizable to us via only this one symbol, even when...

See who is in space right now

Over 600 people have been in space since the space race took off decades ago, with roughly 10 in space at any given time, typically operating the world's growing number of space stations. This fun, simple tracker keeps up on who is in space right now and provides links to each space traveler's profile.

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

Netflix profits when you're not watching, and its movies are designed that way—read a detail-rich critical essay exposing lesser-known Netflix takes

Track the location of the Voyager probes, currently between 13 and 15 billion miles away from Earth.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

US consumers collectively owe more than $1T to credit card companies—almost as much as they owe in auto loans.

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

In 2025, four executives from large tech companies were given positions in the US Army Reserves—including Palantir Chief Technology Officer Shyam Sankar, which reinforced Palantir's ties with the US military and its role as a leading defense partner.

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

Children are now three times more likely to say they want to be a YouTuber when they grow up than an astronaut, with some even attending 'YouTube camps' that teach kids how to create content for the platform.

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

A century of Billboard issues documenting the evolution of popular music.

Explore the known asteroids, comets, and spacecraft involved in asteroid studies within our solar system with 'Eyes on Asteroids,' a 3D visualization from NASA.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

Learn how your body is, scientifically, like a firework with its own slow, controlled burn.

According to the physics of black holes, our 4D reality may be a hologram—a projection of information coded on a 2D surface on the edge of the universe.

Scientists can determine Earth's past climate conditions by analyzing air trapped in microscopic bubbles within ice cores—columns of compressed snow layers that build up over hundreds of thousands of years.

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

Explore the history, structure, and species of Australia's Great Barrier Reef with this interactive journey narrated by Sir David Attenborough.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

Some researchers have labeled nomophobia, the fear of being without your phone, as 'the phobia of the 21st century.'

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

Watch how viruses like Ebola can spill over from animals to humans—and vice-versa.

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

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.