1. The tiny male paper nautilus, an octopus, impregnates the much larger female by shooting his penis (a modified tentacle) into her—and leaving it there.

2. Anthraquinone is an important and widely used raw material for the manufacture of vat dyes, which are a class of water-insoluble dyes that can easily be reduced to a water-soluble and usually colourless leuco form that readily impregnates ibres and textiles