Day 04: Favorite technology!
The uterine replicators are by far the most important technology in vorkosiverse. Nothing else has the same impact on the setting or the plot, except maybe jumpships - but this is a comedy of biology and manners. In worldbuilding terms, they’re the perfect invention. Simple concept, far-reaching and logically consistent effects, fits right in with the themes of genetics and inheritance. Plus, it allows you to do some really interesting stuff with gender roles and social upheaval on Barrayar.