The spellbinding conclusion to the Darkangel Trilogy! Armed with a magical pearl imbued with all the sorcery and wisdom of the world, bestowed upon her by the Ancient known as Ravenna, Aeriel finally comes face-to-face with the White Witch and her vampire sons. Backed by her husband, his army of good, and a throng of magical steeds, she must unlock the power of the pearl to awaken her true destiny and save the world.

With the aid of a shimmering pearl, Aeriel battles the White Witch to free her husband Irrylath and discovers her own true destiny.

The Darkangel, a vampire of astounding beauty and youth, can only summon his full power when he finds his 14th and final bride. But for Aeriel, whom he kidnaps to serve his brides, there is something about him--something beyond his obvious evil--that makes her want to save him rather than destroy him. The Darkangel--Pierce's first book, originally released in 1982--was an ALA Best Book for Young Adults, a New York Times Notable Children's Book, a Parent's Choice Award Superbook, and a Booklist Best Book of the Decade.

Includes over three hundred color photos, covers thirty-five genera of bamboos in cultivation, and describes more than three hundred species and cultivars, with each entry including the plant's maximum height, maximum diameter, light requirements, and minimum temperature tolerated. Original.

Painfully aware that her husband Irrylath is still not free of the White Witch's spell, Aeriel sets out on a dangerous quest to gather the winged steeds that Irrylath and his brothers need to do battle against the powerful witch.

A Turing Award-winning computer scientist and statistician shows how understanding causality has revolutionized science and will revolutionize artificial intelligence "Correlation is not causation." This mantra, chanted by scientists for more than a century, has led to a virtual prohibition on causal talk. Today, that taboo is dead. The causal revolution, instigated by Judea Pearl and his colleagues, has cut through a century of confusion and established causality -- the study of cause and effect -- on a firm scientific basis. His work explains how we can know easy things, like whether it was rain or a sprinkler that made a sidewalk wet; and how to answer hard questions, like whether a drug cured an illness. Pearl's work enables us to know not just whether one thing causes another: it lets us explore the world that is and the worlds that could have been. It shows us the essence of human thought and key to artificial intelligence. Anyone who wants to understand either needs The Book of Why.