Culture & Media
Spotify Playlist Notes: a better recommendation needs a reason
Explore Spotify Playlist Notes, write a recommendation with a useful listening cue and distinguish hiding a playlist on your profile from making its access private.
The reading room
Understand the mechanism.
Original explainers with worked examples, practical questions and clear limits.
AI & Productivity
How to read an AI benchmark before choosing a model
Read an AI benchmark alongside its test conditions and cost per useful result. Build a small task-based comparison that includes review time, errors and corrections.
Digital Life
Browser extension permissions: how much access is worth giving?
Review browser extension permissions against the job each tool performs. Compare site access, restrict unnecessary reach and remove tools that no longer earn their place.
Work & Careers
The hidden cost of choosing one meeting time for a global team
Plan meetings across time zones with real working hours and daylight-saving changes. Share inconvenient slots fairly and compare live discussion with written decisions.
Travel
Compare the carry-on allowance before comparing the airfare
Compare carry-on baggage rules before choosing a fare. Measure your bag and add charges for every flight leg using the allowance attached to the actual booking.
Science & Space
How a dip in starlight becomes an exoplanet discovery
Understand an exoplanet transit through changes in starlight. Separate a candidate from a confirmed planet and learn what follow-up observations can help establish.
Photo: ESO/A.Santerne · CC BY 4.0
Sports
F1’s 2026 cost cap: why the bigger number needs context
Read the 2026 F1 cost cap by checking which costs sit inside its boundary. Learn why comparing headline limits alone can mislead and how teams face opportunity costs.
Culture & Media
What you are buying when you buy a digital PC game
Understand a digital game license, installed files and continued access. Compare subscriptions with one-time purchases using actual play habits and service requirements.
Everyday Decisions
Repair or replace an appliance? Compare the years you can use
Compare appliance repair with replacement using full costs, energy assumptions and possible years of service. A worked example shows which uncertainties matter most.
Big Tech
Tesla is selling a story. What do the margins say?
Read Tesla margins beyond the headlines: separate vehicle profits, regulatory credits and cash flow, then test the costs and assumptions behind future growth.
Business & Economy
Trump tariff headlines: who actually absorbs the cost?
Understand Trump tariffs through customs value, supply chains and cost pass-through. A worked example explains why a border tax is not the same as a retail rise.
AI & Productivity
NVIDIA and the AI spending cycle: follow the customer’s cash
Follow NVIDIA and the AI spending cycle from chip revenue to customer investment. Separate installed capacity, paid utilization and the returns that sustain demand.
Big Tech
A robotaxi demonstration is not a business model
Test robotaxi economics with paid miles, utilization and full operating costs. See why a successful demonstration does not establish a profitable transport service.
Business & Economy
Why a Fed rate cut can send stocks in either direction
Understand why Fed rate cuts can move stocks in either direction. Compare discount rates, earnings expectations and the surprise already reflected in market prices.
Business & Economy
Inflation is slowing. Why is everything still expensive?
Slower inflation does not reverse earlier price rises. Use a price-index example to distinguish disinflation, deflation and the purchasing power of your own budget.
Markets
A low P/E ratio is a question, not a bargain label
Read a P/E ratio with the right earnings definition. Compare trailing and forward estimates, cyclical profits and debt before treating a low multiple as a bargain.
Markets
Profitable on paper, short of cash: how that happens
See why profit and cash flow can diverge. A worked example connects receivables, inventory and capital spending to the money a business actually has available.
Photo: stevepb, via Wikimedia Commons · CC0 1.0
Markets
The company beat earnings. Why did its stock fall?
An earnings beat can still disappoint investors. Separate reported results, expectations, guidance and valuation to understand why a stock may fall on strong news.
Markets
A stock split changes the slice, not the whole pie
Understand stock splits and reverse splits through share counts, adjusted prices and charts. Learn why a lower price per share does not itself create company value.
Markets
Why bond prices fall when yields rise
Learn why bond prices usually fall when market yields rise. Compare fixed coupons, maturity and interest-rate risk, including the difference between bonds and funds.
Personal Finance
Your US stock gained 10%. Your home-currency return may not
Calculate home-currency returns from a foreign stock by combining price and exchange-rate moves. Check quotation direction, hedging and fees before comparing gains.
Personal Finance
Compounding works both ways: returns, losses and the path between
Understand compound growth with changing percentage bases, regular deposits and losses. Separate investment gains, fees and inflation from a calculator's assumptions.
Photo: stevepb, via Wikimedia Commons · CC0 1.0
Markets
A bitcoin ETP is a wrapper, not a risk eraser
Compare a bitcoin ETP with direct bitcoin ownership: custody, fees, trading hours and tracking. Learn what the investment wrapper changes and which risks remain.
Personal Finance
Five funds can still be one crowded bet
Check portfolio diversification beyond the number of funds. Look through shared holdings, sector weights and common business drivers to find hidden concentration.
Photo: Lesekreis, via Wikimedia Commons · CC0 1.0
Digital Life
Passkeys solve a password problem. Recovery deserves equal attention.
Learn how passkeys resist phishing and why account recovery needs equal attention. Check device changes, access to backups and recovery routes before switching.
Work & Careers
Will AI change your job? Start with Tuesday’s tasks.
Assess AI at work by examining real tasks rather than job titles. Measure checking, corrections and useful output to see where assistance saves time or adds work.
Travel
The cheapest connection can cost you the rest of the trip.
Compare a flight connection beyond its fare. Check transfer buffers, separate bookings and local arrival dates, then weigh the consequences of a missed connection.
Science & Space
What are we really seeing in a Webb space image?
Understand the assigned colors in Webb images by checking instruments, infrared wavelengths and processing notes. Learn what the picture measures and what it cannot show.
Sports
A faster offside line still needs an understandable decision.
Read offside technology beyond the on-screen line. Separate position measurements, the selected moment and officials' interpretation to understand the decision.
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Culture & Media
A million streams is a big number. It is not an artist’s payslip.
Understand streaming royalties without turning plays into an artist's payslip. Separate streamshare, rights-holder revenue, contracts and the period being measured.
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Everyday Decisions
The bigger pack is not always the better buy.
Compare unit prices using matching quantities and the final checkout cost. Account for discounts, waste and what you will actually use before choosing a larger pack.
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