What the bundler did: tree shaking, chunks and source maps
You imported one function and shipped 70 KB. Every question starts from a module graph, a bundle treemap, or a build config and asks what the bundler kept, why it kept it, and...
Quizzes
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When demand outruns capacity: rate limits, retries, and backpressure
When requests arrive faster than a system can handle them, it either sheds the extra load or falls over. This quiz covers the limiter algorithms (token and leaky buckets, fixed...
When HBO's Silicon Valley became real: Not Hotdog, the Weissman score and tabs versus spaces
HBO's Silicon Valley hired tech consultants so its jokes would hold up, and a few of those jokes escaped into the real world: a compression metric a Stanford professor invented...
Why buildings don't fall down
A beginner-friendly structural engineering quiz about forces, load paths, and design trade-offs. It focuses on mental models: how bridges, towers, arches, floors, columns, and...
Why messages get lost, duplicated, or reordered, and how to fix it
At-most-once, at-least-once, and "exactly-once" delivery. Why messages go missing or arrive twice, and how idempotency, dedup, sequence numbers, and per-key ordering handle it....
Why that building looks like that
The gap in the sidewalk, the little holes along the bottom of a brick wall, the groove under a window ledge: buildings are covered in details that look like sloppiness and are...
Why web apps feel slow: measuring server latency with percentiles
Your average response time is 120 ms, and your users are still unhappy. This quiz explains the gap: what latency data really looks like, which numbers you can safely combine,...
xkcd predicted it: comics that changed real software
There's an xkcd for everything, and a few of them came true. NIST came around to the password comic. Flickr answered the "is it a bird?" joke within a month. And a boy named...