EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 1 (CEFR A1) Student's Book A (Units 1-6) covers all skills and focuses on the most effective and efficient ways to make progress in English. Each unit in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 4 (CEFR B1+) Student's Book covers all skills and focuses on the most effective and efficient ways to make progress in English. Each of the 12 units in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 2 (CEFR A2) Student's Book covers all skills and focuses on the most effective and efficient ways to make progress in English. Each of the 12 units in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 5 (CEFR B2) Student's Book covers all skills and focuses on the most effective and efficient ways to make progress in English. Each of the 12 units in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 1 (CEFR A1) Student's Book covers all skills and focuses on the most effective and efficient ways to make progress in English. Each of the 12 units in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 4 (CEFR B1+) Student's Book A (Units 1-6) covers all skills and focuses on the most effective and efficient ways to make progress in English. Each unit in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 2 (CEFR A2) Student's Book B (Units 7-12) covers all skills and focuses on the most effective and efficient ways to make progress in English. Each unit in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

In this witty historical fiction middle grade novel set at the turn of the century, an 11-year-old girl explores the natural world, learns about science and animals, and grows up. A Newbery Honor Book. “The most delightful historical novel for tweens in many, many years. . . . Callie's struggles to find a place in the world where she'll be encouraged in the gawky joys of intellectual curiosity are fresh, funny, and poignant today.” —The New Yorker Calpurnia Virginia Tate is eleven years old in 1899 when she wonders why the yellow grasshoppers in her Texas backyard are so much bigger than the green ones. With a little help from her notoriously cantankerous grandfather, an avid naturalist, she figures out that the green grasshoppers are easier to see against the yellow grass, so they are eaten before they can get any larger. As Callie explores the natural world around her, she develops a close relationship with her grandfather, navigates the dangers of living with six brothers, and comes up against just what it means to be a girl at the turn of the century. Author Jacqueline Kelly deftly brings Callie and her family to life, capturing a year of growing up with unique sensitivity and a wry wit. The Evolution of Calpurnia Tate by Jacqueline Kelly was a 2010 Newbery Honor Book and the winner of the 2010 Bank Street - Josette Frank Award. This title has Common Core connections. This is perfect for young readers who like historical fiction, STEM topics, animal stories, and feminist middle grade novels. Don't miss the sequel! The Curious World of Calpurnia Tate To follow Calpurnia Tate on more adventures, read the Calpurnia Tate, Girl Vet chapter book series: Skunked! Counting Sheep Who Gives a Hoot? A Prickly Problem

EVOLVE is a six-level English course that gets students speaking with confidence. Drawing on insights from language teaching experts and real students, this Level 1 (CEFR A1) Student's Book B (Units 7-12) covers all skills and focuses on the most effective and efficient ways to make progress in English. Each unit in the book features Time to speak, a lesson where decision-making and problem-solving tasks enable speaking to thrive. Optional mobile phone activities help create personalized learning experiences.

A famed political scientist's classic argument for a more cooperative world We assume that, in a world ruled by natural selection, selfishness pays. So why cooperate? In The Evolution of Cooperation, political scientist Robert Axelrod seeks to answer this question. In 1980, he organized the famed Computer Prisoners Dilemma Tournament, which sought to find the optimal strategy for survival in a particular game. Over and over, the simplest strategy, a cooperative program called Tit for Tat, shut out the competition. In other words, cooperation, not unfettered competition, turns out to be our best chance for survival. A vital book for leaders and decision makers, The Evolution of Cooperation reveals how cooperative principles help us think better about everything from military strategy, to political elections, to family dynamics.