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Series catalog
Every catalog series is free on all plans, and episode 1 of each can be read without an account. Opening episodes are written by our editors; later episodes are produced with AI to the same editorial structure.
Showing 6 series
SQL, From the Ground Up
Technology · Foundational
SQL, From the Ground Up
Query real data with confidence, starting from zero.
Unit Economics for Operators
Business · Intermediate
Unit Economics for Operators
Know whether each sale makes or loses money, and why.
How Vaccines Train the Immune System
Science · Foundational
How Vaccines Train the Immune System
The biology of immune memory, explained without the jargon.
The Fall of the Roman Republic
Humanities · Foundational
The Fall of the Roman Republic
How a five-century republic gave way to one-man rule.
Negotiation Fundamentals
Business · Foundational
Negotiation Fundamentals
Prepare better, ask for more, and leave both sides better off.
Statistics You Actually Use
Science · Foundational
Statistics You Actually Use
The handful of statistical ideas that come up at work, every week.