The keyclick option is helpful to experienced typists who don't need to look at the keyboard.

In plants, the ability to recognize self from nonself plays an important role in fertilization, because self-fertilization will result in less diverse offspring than fertilization with pollen from another individual.

A thanatopic spellweave that would kill a living creature (such as by giving it negative levels equal to its Hit Dice) destroys an undead (though undead such as ghosts, liches, and vampires may reform as normal.)

The repeater retransmits the messages it receives.