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This starter volume uses everyday examples such as a baseball and a beach ball to demonstrate the contrast between hard and soft objects.

We use machines every day, but most of us don't understand how they work. When they break down, most of us have no idea how to fix them. Mechanics are the masters of machines. Readers learn that mechanics work on vehicles, including cars, boats, and buses. They use special tools to take them apart and fix what's wrong, and they use their experience and technology to diagnose problems. They often work long hours, sometimes in bad weather, to get us where we need to go. Your readers will see that mechanics keep our world moving and growing.

Sep forces the moon to give him his wish, to be the maker of enchanted fiddle music but almost pays a horrible price for it.

"Este libro está lleno de preguntas científicas fascinantes y sus respuestas, todas ellas basadas en la ciencia del mundo real. Aprenderás por qué vuelven los búmeran, si un camión puede volar y, por supuesto, cómo meter un huevo en una botella. La respuesta a cada problema explica un principio científico con términos fáciles de comprender, para que no solo resuelvas los enigmas, sino que también aprendas los secretos que hay detrás de los misterios del universo."--Casadellibro.