Danielle Smith-Llera – författare

Deeply religious, the ancient Greeks honored many gods and goddesses. The ancient Greeks believed these gods and goddesses had great power over the weather and the Earth. But they weren’t all-powerful, and they had flaws. From Zeus to Athena, read about the family of gods and goddesses that the ancient Greeks believed watched over them.

Weighing as much as a small car, a rover named Curiosity rolls quietly around Mars. Scientific instruments pack its body and cluster at the end of a mechanical arm. An arrangement of lenses and instruments tops its mast, like a face. To the many NASA workers involved in Curiosity''s mission on Mars, the rover is not simply a robot, but an astronaut bravely exploring an alien place. Curiosity''s instruments collect data and its cameras take images of the Mars landscape, including self-portraits, in vivid color and detail. As it roams and explores, Curiosity will help find the answers to such age-old questions as has there ever been life on Mars? Could there be one day?

To the untrained eye, Photo 51 was simply a grainy black and white image of dark marks scattered in a rough cross shape. But to the eye of a trained scientist, it was a clear portrait of a DNA fiber taken with X-rays. And to young scientists James Watson and Francis Crick, it confirmed their guess of deoxyribonucleic acid''s structure. In 1953 the pair was racing toward solving the mystery of DNA''s structure before other scientists could beat them to it. They and others believed that finding the simple structure of the DNA molecule would answer a great mystery, how do organisms live, grow, develop, and survive, generation after generation? Photo 51 and subsequent models based on the photo would prove to be the key to unlocking the secret of life.

Prepare readers for the next presidential election with this engaging introduction to the Legislative Branch. Learn how the Legislative Branch enacts laws that impact your daily life through fact-filled sidebars, historical context, and examples from the present day.

With the latest Supreme Court Justice confirmation process making headlines, this book provides readers with a relevant and timely introduction to the Judicial Branch. Learn how decisions made by the Judicial Branch affect your day-to-day life, and discover the history behind this branch of government.

With the latest Supreme Court Justice confirmation process making headlines, this book provides readers with a relevant and timely introduction to the Judicial Branch. Learn how decisions made by the Judicial Branch affect your day-to-day life, and discover the history behind this branch of government.

Prepare readers for the next presidential election with this engaging introduction to the Legislative Branch. Learn how the Legislative Branch enacts laws that impact your daily life through fact-filled sidebars, historical context, and examples from the present day.