Author and science journalist Marcus Rosenlund visits the Kauniainen Library to discuss his current book, *Uppfinningarna, nödens moder* (in Finnish, *Edistys ja erehdys*, Kustantamo S&S 2026).

Civilization was built invention by invention and layer by layer, but progress did not come for free. Every major innovation had a price, which often only became apparent much later.

Why did the invention of fire increase the size of the human brain? Why were people sicker after the dawn of agriculture than they had been before?