The Daily Index — Friday, January 2, 2026 · TLDR Index

PROGRAMMING, DESIGN & DATA SCIENCE

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BUILD SOFTWARE. BUILD USERS

Writing a lot of tests doesn't always guarantee software quality. Engineers need to study target users more deeply to really understand how they will use their products. One way to do this is by creating AI users to test software. This can result in a feedback loop that allows engineers to iterate quickly.

dima.day · 4 min

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HASBRO'S SECRET WEAPON FOR TRAINING ITS NEXT LEADERS: A BOARD GAME

Hasbro's 'Toy Tycoon' is a role-playing strategy game designed for up-and-coming leaders. The game takes a full day to play. Players confront a series of scenarios that test their managerial mettle. The game helps players think through how to manage their company's cash, time, and other resources, and to pivot when the most thoughtful plans fail. Players aim to build a brand, scale a business, and smartly apply market research.

links.tldrnewsletter.com · 6 min

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2025 LETTER

Silicon Valley and the Communist Party are similar in that both are serious, self-serious, and completely humorless. They both tend to speak in either a bland corporate tone or a philosophical register. These two forces both aim to increase their centrality while weakening the agency of whole nation-states. This article looks at how the two parties differ in their AI efforts and what that might mean for the future of humanity.

danwang.co · 80 min

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WELCOME TO 2026

A look at technological improvements in the recent past and the achievements they will unlock for humanity this year.

links.tldrnewsletter.com · 4 min

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IPV6 JUST TURNED 30 AND STILL HASN'T TAKEN OVER THE WORLD, BUT DON'T CALL IT A FAILURE

IPv6 is not backward-compatible with IPv4, and it doesn't add any major improvements, so there is low incentive to adopt it.

theregister.com · 7 min

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TECHNOLOGY IS CULTURE

If you want to understand how and where technological progress happens, you have to look at cultural drivers, not what academia is accomplishing.

lemire.me · 2 min

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WELCOME TO GAS TOWN

Gas Town is an IDE that helps developers with the tedium of running lots of Claude Code instances.

links.tldrnewsletter.com · 50 min

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HOW META'S REELS BECAME A $50 BILLION BUSINESS

Meta's Reels is set to bring in as much as Coca-Cola and Nike, and the company plans to expand to more screens this year.

links.tldrnewsletter.com · 4 min

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SOFTWARE TAKETH AWAY FASTER THAN HARDWARE GIVETH: WHY C++ PROGRAMMERS KEEP GROWING FAST DESPITE COMPETITION, SAFETY, AND AI

Our demand for solving ever-larger computing problems consistently outstrips our ability to build greater computing capacity.

herbsutter.com · 12 min