Yes, I'm familiar with many famous people from around the world. Here's a brief overview of some notable figures mentioned in your description:

• Alexander the Great: King of Macedonia who created one of the largest empires in ancient history.
• Benjamin Franklin: American polymath and one of the Founding Fathers of the United States.
• Joan of Arc: French heroine and Roman Catholic saint known for her role in the Hundred Years' War.
• Fred Astaire: American dancer, singer, actor, and choreographer famous for his work in film musicals.
• Louis Armstrong: American jazz trumpeter and singer who was one of the most influential figures in jazz music.
• Winston Churchill: British statesman, army officer, and writer who served as Prime Minister of the United Kingdom during World War II.
• Julius Caesar: Roman military general and statesman who played a critical role in the events that led to the demise of the Roman Republic and the rise of the Roman Empire.
• Alfred Hitchcock: English filmmaker known as the "Master of Suspense" for his work in thriller and suspense films.
• Blaise Pascal: French mathematician, physicist, inventor, philosopher, and Catholic writer.
• Igor Sikorsky: Russian-American aviation pioneer in both helicopters and fixed-wing aircraft.
• William Shakespeare: English playwright and poet, widely regarded as the greatest writer in the English language.
• Leo Tolstoy: Russian writer known for his novels "War and Peace" and "Anna Karenina."
• Johann Sebastian Bach: German composer and musician of the Baroque period.
• Leonard Bernstein: American composer, conductor, author, music lecturer, and pianist.
• Michelangelo: Italian sculptor, painter, architect, and poet of the High Renaissance.
• Georgia O'Keeffe: American artist known for her paintings of enlarged flowers, New York skyscrapers, and New Mexico landscapes.
• Leonardo da Vinci: Italian polymath whose interests included invention, painting, sculpting, architecture, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography.
• Isaac Newton: English mathematician, physicist, astronomer, theologian, and author who is widely recognized as one of the most influential scientists in history.
• Charles Darwin: English naturalist, geologist, and biologist, best known for his contributions to the science of evolution.
• Thomas Edison: American inventor and businessman who has been described as America's greatest inventor.
• Ernest Hemingway: American novelist, short story writer, and journalist known for his economical and understated style.

These are just a few of the many historical and cultural figures that might be featured in the app you described. The app seems to offer a comprehensive and engaging way to learn about these personalities through various quiz formats and learning tools.