La tumba tenebrosa

Bright stars twinkle in the night sky. Have you looked up into the sky on a clear night and seen these tiny points of light? Did you know that there are many kinds of stars in space? Find out all about them in this Spanish-translated book.

Tener la regla mola... Pero hay que saber cómo funciona. ¿Qué es la menstruación?,¿cómo te transforma el ciclo menstrual?, ¿la regla duele?, ¿qué opciones tienes para no mancharte?, ¿la primera regla llega de repente? Todo lo que siempre has querido saber sobre la menstruación (y nunca te has atrevido a preguntar) explicado de forma directa y divertida para vivir estos cambios con confianza y bienestar. Porque tener la regla mola, pero hay que saber cómo funciona.

During the XVII and XVIII centuries, there were great thinkers who risked their freedom and their lives over their revolutionary ideas. Take a look at the philosophers that were the pillars of both modern thinking and science: Galileo, Hobbes, Newton, and many more. They dared to question the norm.

Defines pulleys, explains their functions, and suggests simple experiments to demonstrate how they work.