La reproducción de las plantas (Plant Reproduction)

What is matter and where can it be found? Everything in the world is made of matter, whether it is a solid, a liquid, or a gas. Important ideas about matter such as volume, mass, and how matter changes state are conveyed through a series of easy-to-do experiments.

Did you know that pigs are some of the smartest animals on Earth? Pigs keep themselves very clean. Discover more about these farm animals in My Pig.

Aisha, el caballo más veloz del mundo, fue robado por un terrorista experto en genética, quien adelanta escabrosos experimentos de clonación no solo con animales, sino también con humanos. Su labor se escuda en una reconocida firma de investigación que compite en la carrera científica por descifrar la clave de la vida: el genoma humano, labor en la que también está empeñado Dan, un prestigioso genetista de la Universidad de Miami, amigo de la tía Abi y de los chicos aventureros. En compañía de Dan, este grupo conocerá los avances de la ingeniería genética, ciencia que permite...

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther.