3 articles
How three plain requirements — variation, heritability, and differential reproduction — force populations to change, why the algebra of allele frequencies makes it inevitable, and where random drift takes over from selection.
What antibiotics actually attack, why they do nothing to viruses, the four ways bacteria defeat them, and why a dose that is almost strong enough is the worst dose of all.
How a single fixed-point idea — nobody can improve by changing their mind alone — explains cartels, auctions, arms races, and why cooperation still manages to survive.