6-7, rizz and rage bait: decoding the words of the year
Every year the big English dictionaries each pick a Word of the Year, and lately the winners come from TikTok and AI. This quiz covers the winners announced for 2023 to 2025:...
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Behavioral economics: loss aversion, the decoy effect, and the power of free
Forty questions on the most famous findings in behavioral economics — why losses hurt about twice as much as equivalent gains, how a useless third option (the decoy) can flip...
Big numbers in the economy: estimate GDP, inflation math, and compound interest
Sixty-three questions that turn the economy's most quoted numbers into math you can actually do in your head. Three pillars: estimating GDP (the C + I + G + (X − M) identity,...
Big-O you can feel: complexity through re-renders and DOM work
Algorithms for frontend engineers — taught entirely through the costs you actually pay in the browser, so you feel asymptotic complexity instead of memorizing it. Three...
Binary data in Node.js: encodings, byte order, and shared memory
How Buffer, Uint8Array, ArrayBuffer, and DataView relate, how encodings and byte order work, which operations share memory, and why turning binary data into a string destroys...
Bugs that pass a quick read: reviewing AI-generated TypeScript and SQL
Find the bugs in AI-written TypeScript, React, browser, Node.js, and SQL code that looks fine at first glance. You'll run into race conditions, security holes, made-up APIs,...
Cache eviction in TanStack Query and SWR: staleTime, gcTime & LRU
You probably use TanStack Query or SWR every day. Start with a familiar puzzle, 'why did React Query refetch this?', and learn how staleTime and gcTime decide when cached data...
Charts that lie: truncated axes, twin scales and misleading bubbles
Every chart in this quiz uses real numbers, yet each one misleads through its baseline, second y-axis, bubble radius, date range, or scale. Learn to read how a chart encodes...
Color on the web: gamut, gamma & why your gradient goes gray
#808080 is not half as bright as white, a 50%-lightness yellow and a 50%-lightness blue are nothing alike, and a blue-to-yellow gradient turns gray in the middle for a reason....
Compression on the web: Huffman, LZ77, Brotli, and the base64 tax
Compression is the cheapest speed win on the web, and it's often applied to the wrong bytes. Learn what makes data compressible, how Huffman coding and LZ77 work, why Brotli...
Copyright & licenses for people who ship code
What MIT's one condition actually obliges you to do, why Apache-2.0's patent grant is the reason big companies prefer it, what really triggers AGPL section 13, and why "no...
Core Web Vitals in practice: loading, responsiveness, and layout shifts
Work through scenarios with slow loading, laggy clicks, and jumping layouts. Along the way you'll cover LCP, INP, CLS, resource loading, hydration, web fonts, and why lab and...