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No one knows for sure just how the ancient Egyptians built the Great Pyramid of Giza, which is taller than the Statue of Liberty. How could an ancient civilization have achieved this engineering feat? Perhaps the solution to this mystery can be answered with simple machines!

On a chilly day in 1947, a Japanese inventor named Momofuku Ando observed people waiting out in the cold for a hot meal. He dreamed of bringing fast-cooking noodles to the whole world. And he did—with ramen noodles! Sometimes the simplest inventions are the best!

Did you know hot air balloons were dreamed up by a French boy in the 1700s? Joseph Montgolfier devoted his life to experiments that he hoped would allow him to fly. With the help of his little brother, his invention allowed humans to fly for the first time in history!

Even without cars or electricity, the Ancient Greeks had some pretty great thinkers. One of the greatest mathematical thinkers was Archimedes. Why do we always remember Archimedes yelling out "Eureka!" in the bathtub? Listen and find out!

It was once common for children to work at jobs with little pay. Then a photographer named Lewis Hine urged this dangerous practice stop to with the power of his camera and the assistance of lawmakers. Learn more about the history of child labor in the United States and how it became outlawed.

In the 1600s, a boy from colonial Jamestown named Thomas Savage was traded to the Powhatans in exchange for a boy named Namontack. The English hoped this gift would prove their friendship to Chief Powhatan and allow them to teach Namontack about England. While staying with the tribe, Thomas learned their language and culture, and served as an interpreter between the Native Americans and Europeans.

Did you know that in the late nineteenth century, the United States military used bikes to travel from one place to another? They were a new invention and a quicker way to travel than walking. Lieutenant James Moss and twenty soldiers tested the durability of bikes by traveling through six states from the West to the Midwest to prove its usability in the military.

Native Americans like Squanto provided good fortune for the Pilgrims of colonial America. During this period, tensions were high between Europeans and the Native Americans in present-day Massachusetts. Squanto, Samoset, and Hobbamock served as interpreters and ambassadors, establishing peaceful alliances between these two groups.

Injured by a cannonball, James Edward Hanger was the first amputee of the Civil War. Determined to find a better solution than a peg leg, he worked to develop his own artificial limb company. He even continued working past retirement, providing Hanger Limbs for victims of World War I.

Many immigrants of various cultures have passed through the port city of Philadelphia before they adapted to the New World. William Penn guaranteed religious freedom to newcomers, which brought many persecuted peoples, such as Quakers, Mennonites, and refugees to the area, and that's only a smart part of the story of Philadelphia.

Confederate Major Absalom Grimes carried letters between Civil War soldiers and their families, and became an expert prison escape artist in the process. Hear about Grimes' amazing life of adventure in this historical nonfiction story.

America's path to revolution was paved by the great discussions of the Continental Congress, which gathered to address grievances against Great Britain. Adamant that the Colonies remain under British rule, King George III fueled the flames of American independence.

Do you know the Confederacy had a navy during the Civil War? The CSS Shenandoah plundered Union ships in order to disrupt their commerce. Because they were out at sea, though, they never heard that the Confederates had surrendered, and they continued to fight! Learn about how these sailors were the last Confederate force to surrender.

In a planned conspiracy to burn down major buildings in New York City during the Civil War, eight men of the Confederacy committed acts of terrorism. They attempted to destroy the city and claim it for the South by building a "Greek fire," which is stronger than regular fire because it is caused by chemical reactions.

Philadelphia was a noisy and lively city in Colonial America. In this story, you can just imagine being surrounded by the influence of various cultures, the smells of food in the city and the sounds of craftsmen hard at work.

In Colonial America, the port city of Philadelphia offered more opportunities for women like Rebecca Jones, a Quaker spinster and schoolteacher.

Emma Edmonds, a woman disguised as Private Frank Thompson, earned a spot in U.S. history as a successful Union spy during the American Civil War. At different times, she also posed as an Irish peddler woman, a black laundress, and a Confederate sympathizer.

Union Colonel Thomas E. Rose was captured in a Civil War battle and thrown in the brutal and secure Libby Prison. He quickly realizes that tunneling out is the only way to escape and joins forces with Major A. G. Hamilton to begin digging to freedom.

Benjamin Franklin was often curious about the world around him. Utilizing observation and testing of the scientific method, he was able to invent many new items that improved the world for others. These inventions include his famous bifocal glasses, lightning rod, and even a long extension arm.

This funny story investigates the mystery of the step pyramid of Djoser in Egypt. But beware: a pharaoh's tomb built in the desert millennia ago can still trap a clumsy explorer! If you were stuck in the dark with scorpions and snakes for company, what would you do?