Birds do it, bees do it; even water fleas do it! Reproduction without fertilisation is more common than you might think.
Despoina Allagioti looks at a few facts about these tiny creatures that can stir up the waters.
Vikki Smith explains the science behind grandmothering.
Jonathan Orgill investigates musical foreplay, bondage, genital mutilation, guarding, hypnotism and cannibalism. Also spiders.