Del hacha al cierre: Las máquinas simples - 6-Pack

Since ancient times, people have used simple machines—tools for making work easier. Indeed, it would have been impossible for the ancient Egyptians to move millions of stone blocks to build the pyramids without the help of ramps. A ramp is a simple machine. How much do you know about the simple machines you use daily at work and play? Learn about these useful objects in this book.