What a context window is, and why your chatbot forgets
An AI model can only read so much at once. That limit explains lost instructions, rising costs and why long chats drift.
Explainers
How the technology, the sensors and the markets in our stories work.
Heart rate variability: what your watch is measuring
HRV is the tiny variation in timing between heartbeats. Wearables use it as a signal of recovery and stress. Here is how to read the number.
How continuous glucose monitors work
A CGM reads glucose from the fluid under your skin every few minutes. Knowing what it measures explains why it sometimes disagrees with a fingerstick.
How prediction market prices work
A contract trading at 62 cents implies roughly a 62% chance. Here is where that number comes from and what it leaves out.
On-device AI versus cloud AI: what runs where, and why it matters
Some AI features work with no connection and others need a data center. The split comes down to size, speed, privacy and cost.
How an order book works: bids, asks and the spread
Every market price is the meeting point of two lists of orders. Reading those lists shows what a trade will cost before you place it.
Passkeys explained: how signing in without a password works
A passkey replaces the secret you type with a key your device keeps. Here is what happens when you tap to sign in.
Position sizing: the math of risking 1%
How much you buy matters more than what you buy. One formula turns a risk limit into a share count, and the numbers show why small is durable.
Prop firm evaluations explained: targets, drawdowns and the fine print
Pay a fee, pass a trading test, trade the firm's money. The rules decide whether that is a fair shot, so here is how they work.
RAG explained: how a chatbot answers from your documents
Retrieval-augmented generation looks things up before it answers. It is how most company chatbots work, and its weak points are predictable.
How smartwatch blood oxygen readings work, and where they fall short
A watch estimates blood oxygen by shining red and infrared light into your wrist. The method is sound and the wrist is a hard place to do it.
Trailing versus static drawdown: the rule that ends most funded accounts
Two accounts with the same $2,500 loss limit can be very different to trade. The difference is whether the floor moves.
VO2 max on your watch: how it is estimated
The lab test needs a mask and a treadmill. Your watch works it out from pace and heart rate. Here is what the estimate is good for.
What a sleep score measures, and what it guesses
Your wearable turns a night into a number out of 100. Some of the inputs are solid measurements and some are estimates.
What an AI agent is, minus the hype
An agent is a language model that can take actions in a loop. That one difference from a chatbot explains both the promise and the risk.
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