The Daily Index — Thursday, October 9, 2025 · TLDR Index

PROGRAMMING, DESIGN & DATA SCIENCE

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A PRAGMATIC GUIDE TO MODERN CSS COLOURS

A lot about colors in CSS has changed over the last few years, including updates to the syntax of familiar features and all-new ways of working with colors. These new features can help developers who don't necessarily focus on design. This article looks at the most useful features for developers who aren't trying to pick their own colors or do any color manipulation.

piccalil.li · 17 min

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AN INTERVIEW WITH OPENAI CEO SAM ALTMAN ABOUT DEVDAY AND THE AI BUILDOUT

In the last seven months, OpenAI has unveiled GPT-5, launched the viral video app Sora, and made several announcements about a massive AI buildout with a variety of partners. This article contains an interview with OpenAI's Sam Altman, where he discusses all of those infrastructure announcements, why Altman's investor skills are particularly useful as CEO, apps in ChatGPT, Instant Checkout, Sora, and how OpenAI thinks about user feedback. Altman and OpenAI are presenting an increasingly coherent vision about what OpenAI is building towards. The interview is also available as a podcast.

stratechery.com · 38 min

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SHAYNE COPLAN BECOMES YOUNGEST SELF-MADE BILLIONAIRE AFTER POLYMARKET'S $2B INVESTMENT: BBG

Shayne Coplan, founder and CEO of Polymarket, a blockchain-based prediction market, has become the world's youngest self-made billionaire at 27. His company will receive as much as $2 billion in investment from Intercontinental Exchange. Polymarket lets users wager on real-world outcomes using cryptocurrency. Users wagered more than $3 billion on potential outcomes during the 2024 US presidential election.

finance.yahoo.com · 2 min

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OPENAI'S RISING TIDE STRATEGY

OpenAI's strategy may create a virtuous cycle where AI demand funds AI build out, which fuels AI demand.

spyglass.org · 5 min

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IN DEFENSE OF RUTHLESS MANAGERS

While most engineers would prefer an empathetic manager, there are still several upsides to having a ruthless manager.

seangoedecke.com · 4 min

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TOYOTA AIMS TO LAUNCH THE ‘WORLD'S FIRST' ALL-SOLID-STATE EV BATTERIES

Toyota claims its all-solid-state batteries, which could arrive as soon as 2027, significantly enhance driving range, charging times, and output.

electrek.co · 3 min

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THE REMARKABLE RISE OF EBIRD—THE WORLD'S BIGGEST CITIZEN SCIENCE PROJECT

eBird allows ornithologists around the world to document bird distribution, abundance, habitat use, and trends within a simple scientific framework.

phys.org · 7 min

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HOW WI-FI SIGNALS CAN BE USED TO DETECT YOUR HEARTBEAT

Pulse-Fi, a new heart rate monitoring technique that uses ambient Wi-Fi signals, is low-cost and easily deployable, and it removes the need for people to wear devices on their bodies.

spectrum.ieee.org · 3 min

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HUMAN-ORIENTED MARKUP LANGUAGE

Human-oriented Markup Language is a serialization language for documents, datasets, and configuration that prioritizes strict form for human readability.

huml.io · 2 min