Vocabulary Daily

Each day, pick a recent article and learn its most interesting vocabulary. We surface the hardest words, show you the sentence each appeared in, and ask you to define them. Your answer is graded against a real dictionary — not a guess from an AI. Earn a comprehension badge for every set you pass. Self-study to grow your vocabulary from real writing — not a credential.

How this works

Pick a recent article from the Arc Codex feed. We extract its five most interesting vocabulary words using a word-frequency filter (no proper nouns, no boring long words), show you the sentence each appeared in, and ask you to define them in your own words. Your answers are graded against a real dictionary definition — the meaning is never invented by an AI, so a wrong definition can't slip through. Pass at 70%+ to log a badge with your name on it. Self-study to grow your vocabulary — not a credential.

Today's words · 21 articles

A Multi

economic_finance

Summary: Same story as last week. And the week before that. And the week before that. Path of least resistance for the SPX remains up. But we’ve entered a period of weak seasonality that runs through mid-October. Short-t…

Macro Ops2026-08-29930 words

Tech backlash reaches fever pitch as AI angst collides with social media fears

economic_finance

Silicon Valley's technology leaders have long dreamed of making the world a better place. But now more than ever, Americans say they're living in a tech-induced nightmare. The rapid rise of artificial intelligence giants…

CNBC - Top News2026-08-291538 words

Haunted Drake’s Island with Grade-II listed house, 6.4-acre site, tunnels goes on sale for over £2M

general

A tiny historic island off the coast of Plymouth, England, featuring a Grade-II listed house, a vast underground tunnel network and former military buildings, has gone on the market for offers above £2 million, according…

Times of India - World News2026-08-291366 words

How Tarot re

economic_finance

I spent a major slab of my summer slowly and luxuriantly reading a huge, dense, and astounding book. Meditations on the Tarot: A Journey into Christian Hermeticism was first published in French in 1980 — anonymously in a…

UnHerd2026-08-291608 words

Africa’s Wild Dogs Are the Most Hated Carnivores on the Continent. Here’s Why Some Conservationists Are Saving Them Anyway

tech_surveillance

Apparently, African wild dogs enjoy knocking around balls of elephant dung like a football. It’s this playfulness that has endeared them to researchers—but, as Helen Sullivan points out, they have their work cut out for …

Longreads2026-08-29447 words

Trump and Kennedy’s Health Industry Deals Haven’t Been Enforced and Are at Risk of Vanishing

tech_surveillance

Trump and Kennedy’s Health Industry Deals Haven’t Been Enforced and Are at Risk of Vanishing In the thick of his competitive reelection race in Michigan, Republican Rep. Tom Barrett joined Health and Human Services Secre…

Kaiser Health News (KHN)2026-08-291803 words

Icelanders go to polls in EU membership talks referendum

economic_finance

Voters in Iceland are taking part in a referendum on whether or not to revive membership talks with the European Union, more than a decade after they were frozen. The coalition government brought forward the referendum f…

RTÉ Nuacht2026-08-29700 words

10 Essential Agentic AI Concepts Explained Simply

tech_surveillance

AI agents are everywhere right now. You hear terms like tool calling, agent loops, MCP, guardrails thrown around as if its common language… it isn’t! But that is about to change. Agentic AI isn’t nearly as complicated as…

Analytics Vidhya2026-08-291022 words

Stand and fight Calum Stuart

general

The day I interviewed Daniel York Loh, there was news of anti-immigration protests—some of which turned violent—erupting across Belfast, Northern Ireland. The BBC reported that people had been targeted simply for having …

Mekong Review2026-08-293119 words

Trump declares national emergency on imported energy distribution technologies

tech_surveillance

President Donald Trump has declared a national emergency prohibiting the use of energy transmission technologies produced in a select group of countries on the grounds of national security risk to American infrastructure…

Solar Power World2026-08-29439 words

The geopolitical imperative for a self

tech_surveillance

US President Donald Trump’s abrupt directive on August 16, 2026, to drastically scale back the joint “Ulchi Freedom Shield” (UFS) military exercises sent shockwaves across the Asia-Pacific geostrategic landscape. The uni…

Asia Times2026-08-29975 words

Are African stocks riskier than the US market?

general

American investor Finn Walker is the managing partner of Heron Partners, which invests in companies listed on African stock exchanges. One of the key reasons Walker is bullish on Africa is the continent’s young and fast-…

How We Made It In Africa (Business)2026-08-29374 words

Why 'Equal Weight' S&P 500 Funds Are Having A Moment

economic_finance

If you have part of your portfolio in an S&P 500 index fund, you’re probably patting yourself on the back for the 12%-plus performance you’ve already notched this year. But you could have done even better. A less fla…

Private Wealth2026-08-29647 words

How Claude Watermarks AI

tech_surveillance

I recently posted a Substack note about Claude’s new watermarking process and implementation. Since it’s such a popular topic and sparked such a lively discussion, I thought it might be interesting to go into a bit more …

Sebastian Raschka AI Magazine2026-08-297739 words

Using the GitHub Copilot SDK for Java

tech_surveillance

Edward Burns Ed Burns is a Principal Software Engineer working to bring Java idiomatic experiences to Microsoft and GitHub technologies. Ed's been working with Java since 1997 in all aspects from client to server to clou…

GitHub Engineering2026-08-291767 words

Why Bangladesh must pivot to renewable energy now

general

Why Bangladesh must pivot to renewable energy now There are moments in a nation’s history when a crisis does more than create hardship. It reveals the weakness of an old system and opens the door to a better one. Banglad…

Daily Star (Bangladesh)2026-08-282305 words

Fireside Friday with… Transcend’s Bimal Kadikar

economic_finance

Transcend recently completed a Series B funding round – what does that investment allow the firm to do that it couldn’t do before? We’ve been very fortunate because we’ve grown well and quite aggressively over the last f…

Global Custodian2026-08-281277 words

Nepal flood: Death toll rises to 547, nearly 1,000 still missing; fresh flood alert issued

general

The death toll from the catastrophic floods in Nepal has risen to 547, while 977 people remain missing, as rescue and recovery operations continue across the worst-affected areas. The disaster has also caused extensive d…

Zee News2026-08-28959 words

AI Companion Robots Are Closing the Human Connection in Modern Homes

tech_surveillance

This article is brought to you by Ollobot. From about 2017, individuals began to truly connect with the initial wave of companion robots. These devices had personality, moved around, joked, and answered when you spoke to…

IEEE Spectrum - AI2026-08-281652 words

Planning a New Era of Discovery with the Upgraded Advanced Light Source

tech_surveillance

Scientists around the world use the focused beams of light generated by the Advanced Light Source (ALS) synchrotron to study molecules and materials with atomic precision — yielding fundamental insights into fields rangi…

Lawrence Berkeley Lab News2026-08-28995 words

Transgender former Israeli spy detained by ICE in US

general

Transgender former Israeli spy detained by ICE in US Blake Fagan / AFP A transgender Israeli woman who served in Israel’s military intelligence directorate is facing deportation from the US after being convicted of impri…

Middle East Eye2026-08-28370 words