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What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.

Wismichu, uno de los mayores youtubers españoles, te explica todas las claves imprescindibles para sobrevivir en el mundo de hoy en día. Este no es otro libro de youtubers. Este libro te aportará algo, o al menos lo intentará. Porque al final, internet es como el patio del cole: un infierno. Así que, básicamente, tienes que aprender a defenderte, porque si te rindes, pierdes. Aprende a identificar a tus amigos y -más importante todavía- aprende a identificar a los trolls y a evitarlos como la peste. Aprende cómo destacar, cómo conservar tu personalidad y no convertirte en un clan de ...

As they say, necessity is the mother of invention, and this book introduces readers to 14 women who invented very useful, helpful items. They include Chicago native Margaret Wilcox who invented the car heater, Indiana native Marion O'Brien Donovan who invented disposable diapers, Pennsylvania native Stephanie Kwolek who invented Kevlar, and Austria-born actress Hedy Lamar whose secret communications systems led to the creation of WiFi, Bluetooth, and GPS.

Celebrating tolerance and acceptance, each title in this constructive and accessible series focuses on the rewards and challenges of having a friend with a disability. Everyday situations are accompanied by informative sidebars that provide details about the highlighted disability.