El cero y el infinito

Practice time measurement by timing races! Racing is all about having the fastest time, so accurate time measurement is very important for athletes! Young readers will learn all about how athletes measure racing times and will practice their mathematical and STEM skills. The Spanish-translated text, vibrant images, fun practice problems, and helpful mathematical charts in this title make time measurement seem exciting and simple!

Describes which animals are loud and which are quiet, including such creatures as cicadas, whales, mice, and fish.

Everyone has heard of Albert Einstein--but what exactly did he do? How much do kids really know about Albert Einstein besides the funny hair and genius label? For instance, do they know that he was expelled from school as a kid? Finally, here's the story of Albert Einstein's life, told in a fun, engaging way that clearly explores the world he lived in and changed.

Some civil rights figures are household names, while others struggle to get their stories told. This biography details the life and activism of Sylvia Mendez, who helped desegregate California schools in the 1940s in the landmark federal case, Mendez v. Westminster. Latino students, scholars of social justice, and anyone who is inspired by underdog stories will find this highly engaging account of change compelling and informative, including its helpful timeline and historical imagery. Students will be engaged and inspired by a story that has gotten its due as more than a mere historical...