Signed on September 17, 1787 - four years after the American War for Independence - the Constitution laid out the supreme law of the United States of America. Today it's easy for us to take this blueprint of our government for granted. But the Framers - 55 men from almost all of the original 13 states - argued fiercely for many months over what ended up being only a four-page document. Here is a fascinating behind-the-scenes look at the hotly fought issues - those between Northern and Southern States; big states and little ones - and the key players.

Dr. Martin Luther King, Jr., was only 25 when he helped organize the Montgomery bus boycott and was soon organizing black people across the country in support of the right to vote, desegregation, and other basic civil rights. Maintaining nonviolent and peaceful tactics even when his life was threatened, King was also an advocate for the poor and spoke out against racial and economic injustice until his death - from an assassin's bullet - in 1968. 

Mohandas Karamchand Gandhi was born in 1869 in British-occupied India. Though he studied law in London and spent his early adulthood in South Africa, he remained devoted to his homeland and spent the later part of his life working to make India an independent nation. Calling for non-violent civil disobedience, Gandhi led India to independence and inspired movements for civil rights around the world. Gandhi is recognized internationally as a symbol of hope, peace, and freedom. 

The beloved plays of Shakespeare are still produced everywhere, yet the life of the world's most famous playwright remains largely a mystery. Young Will left the town of Stratford to pursue theater in London, where his work eventually thrived and made him a famous and wealthy man. Celeste Davidson Mannis here puts together the pieces of Shakespeare's life and work for young listeners. 

From Susan B. Anthony and Elizabeth Cady Stanton to Gloria Steinem and Hillary Clinton, women throughout US history have fought for equality. In the 19th and early 20th centuries, women were demanding the right to vote. During the 1960s, equal rights and opportunities for women - both at home and in the workplace - were pushed even further. And in the more recent past, Women's Marches have taken place across the world. Celebrate how far women have come with this inspiring listen! 

Marco Polo was 17 when he set out for China...and 41 when he came back! More than 700 years ago, Marco Polo traveled from the medieval city of Venice to the fabled kingdom of the great Kublai Khan, seeing new sights and riches that no Westerner had ever before witnessed. But did Marco Polo experience the things he wrote about...or was it all made up? Young listeners are presented with the facts in this entertaining Who Was...? biography. 

In 1789, George Washington became the first president of the United States. He has been called the father of our country for leading America through its early years. Washington also served in two major wars during his lifetime: the French and Indian War and the American Revolution. Washington's fascinating story comes to life - revealing the real man, not just the face on the dollar bill! 

The man who saved the lives of his PT-109 crewmen during WWII and became the 35th US president fought - and won - his first battle at the age of two-and-a-half, when he was stricken with scarlet fever. Although his presidency was cut short, our nation's youngest elected leader left an indelible mark on the American consciousness and now is profiled in our Who Was...? series. 

Justice Ruth Bader Ginsburg was famous for her stylish collars (called jabots) and her commanding dissents. This opera-loving New Yorker always spoke her mind; as a young lawyer, RBG advocated for gender equality and women's rights when few others did. She gained attention for the cases she won when arguing in front of the Supreme Court, before taking her place on the bench in 1993. Author Patricia Brennan Demuth answers all the questions about what made RBG so irreplaceable and how the late Supreme Court justice left a legacy that will last forever.  

The life of Queen Elizabeth I was dramatic and dangerous: cast out of her father's court at the age of three and imprisoned at 19, Elizabeth was crowned queen in 1558, when she was only 25. A tough, intelligent woman who spoke five languages, Elizabeth ruled for over 40 years and led England through one of its most prosperous periods in history. 

Almost everyone can sing along with the Beatles, but how many young listeners know their whole story? Geoff Edgers, a Boston Globe reporter and hard-core Beatles fan, brings the Fab Four to life in this Who Was...? book. Listeners will learn about their childhoods in Liverpool, their first forays into rock music, what Beatlemania was like, and why they broke up. It's all here in an easy-to-listen-to narrative!

In 1995, on a four-hour-delayed train from Manchester to London, J. K. Rowling conceived of the idea of a boy wizard named Harry Potter. Upon arriving in London, she began immediately writing the first book in the saga. Rowling's true-life, rags-to-riches story is as compelling as the world of Hogwarts that she created. This biography details not only Rowling's life and her love of literature but the story behind the creation of a modern classic.

A thoughtful and age-appropriate introduction to an unimaginable event. The Holocaust was a genocide on a scale never before seen, with as many as twelve million people killed in Nazi death camps - six million of them Jews. Gail Herman traces the rise of Hitler and the Nazis, whose rabid anti-Semitism led first to humiliating anti-Jewish laws, then to ghettos all over Eastern Europe, and ultimately to the Final Solution. She presents just enough information for an elementary-school audience in a well-researched book that covers one of the most horrible events in history.  

Malala Yousafzai was a girl who loved to learn but was told that girls would no longer be allowed to go to school. She wrote a blog that called attention to what was happening in her beautiful corner of Pakistan and realized that words can bring about change. She has continued to speak out for the right of all children to have an education. In 2014, she won the Nobel Peace Prize. 

Leonardo da Vinci was a gifted painter, talented musician, and dedicated scientist and inventor, designing flying machines, submarines, and even helicopters. Yet he had a hard time finishing things, a problem anyone can relate to. Only 13 paintings are known to be his; as for the illustrated encyclopedia he intended to create, all that he left were thousands of disorganized notebook pages.  Here is an accessible portrait of a fascinating man who lived at a fascinating time - Italy during the Renaissance.