Danielle Smith-Llera

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 Chumash thrived along the Pacific coast in California for centuries. But eventually new settlers wanted their land and forced the Chumash into a new way of life. Today, the Chumash celebrate their traditions as they move toward the future in modern America.

The final match of the 2001 U.S. Open featuring tennis stars Venus and Serena Williams was groundbreaking. It was first time siblings had squared off in the final match for more than 100 years. And it was the first time both players were black. The photo of the smiling Williams sisters holding their trophies after the tennis match appeared in newspapers around the globe. It captured two athletes who fought, and would continue to fight, for a place...

What has been called the most famous photograph in the world, and a symbol of the 20th century, began as a spur of the moment snapshot by a Cuban photographer. Alberto Korda transformed a simple photo into a world famous portrait of a larger than life revolutionary. Korda's 1960 photo of Che Guevara's defiant face has traveled the world in many forms. It shows up wherever people struggle for freedom and human rights. And in the 21st century, the controversial...

Imagine traveling a river through time. You float by Native Americans trapping beaver and pass boats full of European settlers. You spy waterwheels turning and factories buzzing with activity. Finally modern cities crowd the banks. Dive into this book, and learn about the changing lives of people in the Hudson River Valley.

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.

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...

A massive tsunami caused by the strongest earthquake to ever hit Japan triggered the world's worst nuclear crisis since the Chernobyl accident 25 years earlier. The monster waves that crashed into the Fukushima Daiichi nuclear plant in March 2011 killed 15,000 people and caused nuclear reactor meltdowns that threatened the lives of thousands more. The waves receded long ago, but the devastating effects of the nuclear accident still linger.

"Betsy Ross made many flags during the American Revolution, but did she sew the first flag? Infographics, leveled text, and primary sources help readers follow the fact and fiction found in this tale of stars and stripes"--

On-point historical photographs combined with strong narration bring the story of the first photograph of a black hole to life. Kids will learn why it was so hard to take a photo of something so dark it does not reflect light, and so far away it could barely be reached. Primary source quotations bring the amazing accomplishment to life.