From Edgar Award-nominated author Martha Freeman comes a "delightful" (Kirkus Reviews) middle grade mystery following a young boy working at his family's secondhand store that is a steal-your-heart story about family and friendship. Arthur Popper helps out in his family's Boulder, Colorado, junk store, Universal Trash, a place so full of cool stuff it inspires awe in first-time shoppers. When it comes to ukuleles, peppermills, and rhinestones, Arthur knows what's what. But unlike his motorcycle-riding grandma and his namesake, King Arthur, he's not brave or adventurous. Then Arthur finds a chipped teacup, of all things, and realizes it's the key to solving the perfect crime--a crime only he knows about. With help from a supernatural sidekick, his best friend, his annoying little sister, and a sad-faced police officer, Arthur embarks on the hard work of detecting. Everyone knows Arthur is good at customer service. Does he have what it takes to solve a mystery and confront a thief?

Twins Mark and Scott discover an abandoned Apollo command module and take off to rescue a stranded Russian cosmonaut in the second Astrotwins adventure from retired NASA astronaut and the #1 New York Times bestselling author of Mousetronaut, Mark Kelly. Mark and Scott Kelly, who are mostly known for getting into trouble, are finally back from their first space adventure. The twins have wanted to explore space ever since they were little and watched Neil Armstrong walk on the moon. And when they hear that a Russian cosmonaut is trapped inside the Salyut space station now orbiting 220 miles above the surface of the Earth, they wish they could find a way to help. While staying in the countryside at their grandfather's house with their friend Jenny (aka Egg), the twins repurpose a NASA Titan 2 rocket ship being stored nearby. Complete with spacesuits and snacks, the twins take off on their rescue mission. Will they ever see their family or their grandfather's backyard again? Written by a NASA astronaut with four space flights under his belt, the second exciting Astrotwins story includes extensive back matter on the space program with fantastic facts and details.

“An inspiring look at women who realized curiosity plus tenacity equals success.” —Kirkus Reviews
“[A] captivating compendium.” —Publishers Weekly

Discover the histories of twenty incredible female scientists in this inspiring biography collection from beloved author Martha Freeman and Google Doodler Katy Wu.

Why do galaxies spin the way they do?
What’s the best kind of house for a Komodo dragon?
Can you cure malaria with medicine made from a plant?

The scientists and mathematicians in Born Curious sought answers to these and many other fascinating questions. And it’s lucky for us they did. Without their vision, insight, and hard work, the world would be a sicker, dirtier, and more dangerous place.

The twenty groundbreaking women—including Rosalind Franklin, Marie Tharp, Shirley Anne Jackson, and more—came from all kinds of backgrounds and had all kinds of life experiences. Some grew up rich. Some grew up poor. Some were always the smartest kid in class. Some struggled to do well in school. But all had one thing in common: They were born curious. Are you curious, too? Read on.