Construir un auto de carreras: Comprobar tu trabajo (Building a Race Car: Checking Your Work)

3 million years ago, men built the first stone tools for hunting. 2 million years ago, men walked in a completely upright position and had already discovered fire. 1 million years ago, men organized themselves in groups... Okay, okay, but what about the women? Where were the women in the meantime?

Con un sentido de humor este libro ilustrado para niños y jóvenes cuenta la historia sobre la vida de los soldados romanos en el tiempo del emperador Adriano.

Spanish English Bilingual children's book. Perfect for kids studying English or Spanish as their second language. Alex finds it hard to go to sleep, so he starts making up excuses. After reading a bedtime story, his father suggests planning a dream that he would like to see when he falls asleep. Find out where their imagination takes them as they plan his dream together. This bedtime story will help kids feel loved and relaxed, preparing them for a peaceful, sleep-filled night.

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.