Experimentos sorprendentes con la luz

In the winter of 1856, a storm delays the lighthouse keeper's return to an island off the coast of Maine, and his daughter Abbie must keep the lights burning by herself.

What is my period exactly? Do I need to see a doctor? What does it feel like to wear a pad? What if I get my period at school? Karen Gravelle and her fifteen-year-old niece, Jennifer Gravelle, have written a down-to-earth and practical book that answers any questions you might have about your period, from what it is and what it feels like, to how to choose pads and tampons, to how to talk to your parents about it. The Period Book will help guide you through all the physical, emotional, and social changes that come with your period, as well as related issues like dealing with pimples, mood...

The rhymes, verses, songs, and riddles in this playful book are designed for children who cannot get enough of word games. Beautiful illustrations bring humor and laughs to every page. Los niños que disfrutan de los juegos de palabras gozarán de las rimas, los versos, las canciones y las adivinanzas en este libro juguetón. Bellas ilustraciones traen humor y carcajadas a cada página.

Inspirándose en el gran astrónomo y divulgador Carl Sagan, Fernando J. Ballesteros y Bartolo Luque reúnen en este volumen quince pequeños ensayos destinados a despertar en los lectores el mismo estímulo y fervor que despertaron en ellos los de su modelo. Con sencillez, amenidad y rigor, 10.000 AÑOS MIRANDO ESTRELLAS (título que hace referencia a los testimonios más antiguos de esta actividad del hombre sobre la Tierra) aborda los asuntos del cosmos que sin duda llaman más la atracción del lector actual: la composición y el origen del universo, los agujeros negros, el comportamiento ...