Danielle Smith-Llera

"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...

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.

Two American athletes made history at the 1968 Summer Olympics, but not on the track. They staged a silent protest against racial injustice. Tommie Smith and John Carlos, gold and bronze medalists in the 200-meter sprint, stood with heads bowed and black-gloved fists raised as the national anthem played during the medal ceremony. The Australian silver medalist wore a human rights badge in support. All three would pay a heavy price for their activism....

Millions of tons of plastic slip into oceans every year. Some floats and travels slowly with the currents, endangering the health of marine animals. The rest is hardly visible but is far more dangerous. Tiny bits of plastic sprinkle the ocean's surface or mix into the sandy seafloor and beaches. It ends up inside birds, fish, and other animals, harming them-and ultimately humans. Experts struggle with fear and hope as they work to stop the flood of...

"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"--

"Explains Powhatan history and highlights Powhatan life in modern society"--

"Explains Chumash history and highlights Chumash life in modern society"--

George Washington knew he was setting an example in everything he did. The first American president had been a heroic military commander during the Revolutionary War, leading his forces to victory. As president he would guide the citizens of a new republic with a strong central government. No more would each state make its own decisions. Instead, they would band together, with the beloved Washington leading the way. It was up to him not to abuse the...

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...

"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 thepresent day"--