10 ríos que transformaron el mundo

¿Sabías que a lo largo de la historia han muerto más personas a causa de las epidemias que por culpa de las guerras y otros desastres? Algunos científicos, a veces arriesgando sus vidas, investigaron las causas de enfermedades como la peste, el cólera, el sida o el ébola. Muchos de ellos fueron objeto de burla, fueron ignorados, e incluso los despidieron de sus trabajos. Sin embargo siguieron intentando encajar las piezas del puzle de las epidemias. Y la primera pieza, la más importante, era el «paciente cero», la primera persona que hubiera contraído la enfermedad, porque así...

Weather is an important science concept at the early elementary level. Recognizing and identifying kinds of weather requires observational skills and certain vocabulary terms. This bright volume allows young meteorologists to correlate weather in carefully selected photographs with descriptive weather vocabulary, such as rainy, sunny, and foggy. It's never too early to tackle this essential STEM theme!

Learn about elections and why voting is important with this Spanish nonfiction book. Perfect for young readers, the book also includes a related fiction story, project, glossary, useful text features, and engaging sidebars. This 28-page full-color Spanish book examines a variety of voting issues and how the election process works. It also covers important topics like democracy and civic duty, and includes an extension activity for grade 2. Perfect for the classroom, at-home learning, or homeschool, to explore election issues, candidates, and being an informed citizen.

HIGH-INTEREST, LOW-LEVEL: Reluctant readers will be engaged from beginning to end as they explore the responsibilities and skills of the catcher in this 32-page nonfiction book. Side-by-side English and Spanish text and vivid, exciting photos show readers what it takes to fill this key position in baseball and softball. SPORTS BOOK FOR KIDS: Catchers squat and they throw. They often call the shots. But most importantly, they catch the ball! From catching fastballs to throwing out base runners, learn why catchers have the toughest job in baseball and softball. INCLUDES: Readers will be hooked...

Learn the history of number systems with this engaging Spanish book! This text combines mathematics and literacy skills, and uses practical, real-world examples of problem solving to teach math and language arts content. Students will learn place value while reading about the number systems of the Egyptians and Romans, and also learn important vocabulary terms like cuneiform, binary systems, roman numerals, and more! The full-color images, math charts, and practice problems make learning math easy and fun. The table of contents, glossary, and index will further understanding of math and...