The Daily Index — Tuesday, September 16, 2025 · TLDR Index

Across today’s newsletters

Today’s Index

TLDR

U.S. AND CHINA REACH ‘FRAMEWORK' FOR A TIKTOK SALE

The US has reached a preliminary deal with China on the fate of TikTok. Both sides have agreed to a framework to divest TikTok from ByteDance. President Trump and Xi Jinping are set to speak on Friday to approve the deal.

links.tldrnewsletter.com · 7 min

TLDR AI

GPT-5 CODEX OPTIMIZED FOR AGENTIC CODING

OpenAI upgraded its Codex agent with GPT-5-Codex, a new model capable of dynamically allocating compute time per task, ranging from seconds to hours, leading to better performance on complex coding benchmarks.

links.tldrnewsletter.com · 11 min

TLDR Web Dev

FALSEHOODS PROGRAMMERS BELIEVE ABOUT NULL POINTERS

Programmers commonly have some misconceptions about null pointers in languages like C, C++, and Rust. This article debunks assumptions ranging from immediate crashes upon dereferencing to the guaranteed address of zero for null pointers. These misconceptions come from compiler optimizations, platform-specific quirks, and the evolving understanding of undefined behavior.

purplesyringa.moe · 12 min

TLDR InfoSec

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Their Cyber Hero Team pre-tests every single update in a controlled environment [4]. You get the security benefits of up-to-date software, without the hassle. And you're always in control with Centralized management across all endpoints and policy based-deployment.

links.tldrnewsletter.com

TLDR Crypto

BASE EXPLORES ISSUING NATIVE TOKEN

Base creator Jesse Pollak announced at the BaseCamp event that the Coinbase-backed L2 is exploring issuing a native token, marking a reversal from the company's 2023 stance that it had no plans for tokenization. Pollak emphasized that plans remain in early stages with no timeline provided, and stressed that as a U.S. company, Base will work closely with regulators on compliance for any token issuance and distribution. The potential token announcement comes as Base has emerged as the second-largest layer-2 by total value locked at $5 billion, with impressive usage metrics including 328 million transactions over the past 30 days compared to Arbitrum's 77 million. The exploration of tokenization could trigger increased activity on Base as users attempt to position themselves for a potential airdrop, similar to patterns seen with other major L2s.

coindesk.com · 5 min

TLDR

SAM ALTMAN-BACKED RETRO BIOSCIENCES STARTS ALZHEIMER'S REVERSAL TRIAL

Retro Biosciences is gearing up for a clinical trial of a drug aimed at reversing the effects of Alzheimer's disease. The drug could potentially restore cognitive function in ways that could redefine longevity treatments. Retro's approach leverages cellular reprogramming techniques. The upcoming trial will test the pill's efficacy in human subjects.

links.tldrnewsletter.com · 4 min

TLDR

NEW ULTRASOUND HELMET REACHES DEEP INSIDE THE BRAIN WITHOUT SURGERY

Researchers have created an ultrasound helmet that could offer an alternative to invasive procedures. It can modulate deep-brain circuits without surgery with unrivaled precision. The helmet offers a safe, reversible, and repeatable method for both understanding brain function and developing targeted therapies. It has potential clinical applications for neurological disorders like Parkinson's disease, where deep-brain regions are especially affected.

sciencealert.com · 4 min

TLDR

A TERMINAL COMMAND THAT TELLS YOU IF YOUR USB-C CABLE IS BAD

Android Studio recently added a new feature that warns users when they connect a slow cable to their phones. This post presents a script that checks USB connections in macOS. The script was originally cobbled together with AI, but while it worked, it was a mess to maintain. The developer used AI to port it to Go so the code could be structured more legibly and more easily tweaked.

kau.sh · 4 min

TLDR

APPLE HAS A PRIVATE CSS PROPERTY TO ADD LIQUID GLASS EFFECTS TO WEB CONTENT

Apple has a custom CSS property named -apple-visual-effect that allows the use of Liquid Glass in iOS 26. It only works by toggling a private setting in WKPreferences, so using it means no App Store approval. No one outside of Apple can use it - and no one knows where Apple is using it.

alastair.is · 3 min