Technology questions

108 fact-checked questions — tap any to predict the answer, then read why.

• Why can a satellite redness index flag rusting Arctic rivers but still fail to tell which streams are chemically hazardous?
• A service publishes a fresh random number every minute, plus a public log in which each entry carries a fingerprint of the entry before it. What does that chaining add?
• Why can a wall of lava lamps used as a camera feed improve encryption even though the cryptographic software that consumes it is deterministic?
• If an attacker learns a pseudorandom generator's seed and algorithm after watching several outputs, why can the later outputs become reconstructable?
• Why does a physical noise source provide security against an attacker who knows the code, while a phone game shuffle does not?
• At parking-lot speed, why do quiet EVs need alert sounds before tire noise helps?
• Why does the Ferrari 296 use a tube to carry engine sound into the cabin from before the exhaust treatment system?
• Why do sound engineers tune engine orders instead of just making a Ferrari-like exhaust louder?
• Why do sports cars use active exhaust valves instead of one permanently loud exhaust pipe?
• Why can adding turbochargers make a sports-car exhaust note feel less raw?
• Why did Ferrari pick a wide 120-degree angle for the 296 GTB's V6 when it wanted the engine to sound like a small V12?
• Why does a flat-plane Ferrari V8 scream while a cross-plane V8 burbles at similar RPMs?
• At the same redline, why does a Ferrari V12 sound higher-pitched than a V6?
• Why can't engineers copying owl wings for turbines simply add serrations everywhere?
• Why does an AI chatbot that can spell out the word 'strawberry' letter by letter still so often miscount how many r's it contains?
• Why is 'answer in exactly 50 characters' harder than it sounds for an LLM?
• Why can one emoji cost an AI language model several tokens when it takes up a single character on your screen?
• Why can a chatbot’s tokenizer—a program that breaks text into smaller pieces—still process the never-seen misspelling “strwberry”?
• Why don't GPT-style tokenizers feed every English word as single letters?
• Why can adding one leading space change a word's token ID in a GPT-style tokenizer?
• When asking an AI to count the r's in “strawberry,” which unit should the prompt name clearly?
• Why can the same AI model feel smart in one app but dumb in another?
• Why can two strong-model assistants differ on complex tasks?
• How does a typical AI assistant process a request?
• Why can one AI assistant appear in Discord, Feishu, and on your phone at the same time?
• What does a product that can switch between Claude, DeepSeek, and GPT most resemble?
• Why can two apps built on the same AI model feel very different to use?
• Which layer of an AI system do applications such as ChatGPT, Claude Code, and Perplexity belong to?
• What do Claude, DeepSeek, and GPT usually refer to?
• Why do people mix up Claude, GPT, and AI apps?
• What is the healthiest way to think about a bigger context window?
• Why does it matter that a text-generating AI model can keep roughly a million tokens—hundreds of thousands of words—available while it answers or writes code?
• What does a context window act like for a language model?
• Why does JavaScript's Temporal API use different types for different time concepts?
• How does making JavaScript Temporal date-and-time values unchangeable help code reuse them safely?
• In JavaScript's Temporal API, when is a ZonedDateTime more useful than a plain Instant?
• In JavaScript's Temporal time API, what does an Instant value represent?
• Why can the same moment show up as different local times in different places?
• What is one big reason `Date` confuses developers?
• Why did JavaScript need a new time API instead of just minor fixes to `Date`?
• Which application most clearly benefits from stronger physical-world models?
• Why are language-only AI systems often limited in physical reasoning?
• What does it mean for AI to understand the physical world?
• How can a robot use an AI model that predicts the results of actions to plan its next move?
• For an AI system that forecasts how its surroundings will change, which task would benefit most if its forecasts became more accurate?
• Why do robots expose AI's limits faster than chatbots?
• Why can't reading about physics give someone full physical intuition?
• Why is physical common sense hard for AI?
• What does a world model help AI represent?
• Why doesn't a computer program that predicts the next word in a sentence thereby predict what happens next in the physical world?
• Why can AI sound like it understands reality when it may not?
• Why do language models struggle with physical reasoning?
• Why are smart homes becoming more popular?
• Why do laptops have trackpads?
• Why do images use different formats?
• Why might someone choose to download a video instead of streaming it?
• What does incognito mode actually keep private on a shared device?
• Why do apps offer dark mode?
• Why can anyone read and modify the code of some software, like Linux or Firefox?
• Why does antivirus software need updates?
• Why do computers need firewalls?
• What determines how sharp a screen image looks?
• Why do emails go to spam?
• Why can a software update take longer to install than to download?
• Why do websites ask for permission to use advertising cookies?
• Why does using a VPN usually slow down an internet connection?
• Why do phones these days need more RAM than older models did?
• Why does clearing your browser cache often fix glitches like outdated pages or login errors?
• Why do passwords need special characters?
• Why do browsers show a lock icon?
• Why do videos buffer more than music?
• Why are some Wi-Fi networks hidden?
• Why do phones need two-factor authentication?
• Why do websites require CAPTCHA?
• Why do files get smaller when zipped?
• Why does GPS need multiple satellites?
• Why can a higher screen refresh rate make scrolling look smoother?
• Why does autocorrect sometimes replace the word you meant with the wrong one?
• Why do websites use cookies?
• Why do email attachments have size limits?
• Why is cloud storage called 'cloud'?
• Why do apps send notifications?
• Why do QR codes work from any angle?
• Why do Bluetooth devices need pairing?
• What causes video buffering?
• Why do computer files have extensions?
• Why do apps need updates?
• Why do USB cables have different ends?
• Why do batteries lose charge over time?
• Why do phones have airplane mode?
• Why do touchscreens work with fingers?
• Why do refrigerators keep food cold?
• Why do old photos turn yellow?
• How does the internet move a message from one computer to another?
• Why do phone screens respond to touch?
• How does GPS determine your location?
• Why can a healthy computer feel slower as more demanding apps are installed over the years?
• How does WiFi carry data between your device and the router?
• How does Bluetooth send data between nearby devices without a cable?
• How does a battery-electric car drive its wheels without burning gasoline?
• How do touchscreens work?
• How do QR codes work?
• Why do batteries run out?
• Why do we need to charge batteries?
• How do LED lights save energy?
• Why do solar panels generate electricity?
• Why can 5G transfer data faster than 4G?
• Why does Wi-Fi have limited range?