El iguánodon (Iguanodon)

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

Depression is an unfortunately common mental health issue that many people don’t know how to address. In this straightforward, practical guide, readers will learn how they can identify and help a friend who is suffering from depression. Written in a compassionate tone, this guide separates out fact from fiction, providing an informative list of myths and facts to dispel common incorrect notions about depression as well as a thoughtful list of questions readers can ask their guidance counselor about a friend’s depression and seeking help. The result? Empowered readers who can lend a hand...

Take a trip to the fire station to learn how firefighters use measurement to put out fires! Full of facts, practice problems, and mathematical charts, this Spanish-translated title teaches children more about measurements like volume and perimeter!

A su paso por Saturno, las sondas Voyager tomaron, en los años 80 del siglo pasado, numerosas fotografías de sus anillos. Aquellas imágenes dieron pie, poco más tarde, a un extravagante experimento. Tras reproducir con suma precisión el diseño de los anillos en forma de surcos sobre un disco de vinilo, la audición desveló por sorpresa, en medio de una sucesión de frecuencias sin sentido, un fragmento de la Ofrenda musical, una de las composiciones más enigmáticas y esotéricas de Johann Sebastian Bach. Este sorprendente resultado podría interpretarse como un atisbo, singular y...