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This is a replay episode of All about Light. When we think of light, we usually picture the bright colors and sunshine that allow us to see the world around us. However, that visible light is actually just a tiny slice—less than one percent—of a massive, invisible river of energy called the electromagnetic spectrum. Today, we’re going to pull back the curtain on that entire spectrum to explore the hidden waves, from radio signals to X-rays, that surround us every single day. OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfrReach out to us with any questions, comments or feedback Support the show

A replay episode from the vault of everything that was happening in our country in the year prior to the War of 1812. Why did we go to war again with Britain, could it avoided and were we up to the task to defeat the mighty British empire again? OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

A replay episode of the life of Alexander The Great. Everything is here in one episode- his upbringing, his early struggles and his untimely death. Along the way he spread Greek culture throughout the known world at the time becoming one of the most influential men of the ancient world. OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfrReach out to us with any questions, comments or feedback Support the show

In 480 BC, a small Greek force led by King Leonidas and his 300 Spartans made a legendary stand against the massive Persian army at the Battle of Thermopylae. Discover what led to this famous battle, how the Greeks held off the Persians, and why their resistance became one of history’s most memorable military encounters. We explore the battle, its aftermath, and how it helped shape the future of ancient Greece. OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfrReach out to us with any questions, comments or feedback Support the show

In 490 BC, the mighty Persian Empire launched an invasion of Greece, setting the stage for one of the most famous battles in ancient history. On the plains of Marathon, a smaller Athenian army faced a powerful Persian force in a battle that would help determine the future of ancient Greece. We explore the events leading up to the Battle of Marathon, the strategies that brought the Greeks an extraordinary victory, and the legendary story that inspired the modern marathon race. Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfrReach out to us with any questions, comments or feedback Support the show

In Part Two of The History of Baseball Cards, we explore how a simple childhood hobby evolved into a multibillion-dollar industry. From the rise and fall of companies like Fleer, Donruss, and Upper Deck to the dominance of Topps and Fanatics, we uncover the business decisions and fierce competition that transformed baseball card collecting. We also examine how card grading, online marketplaces, and box breaks have fueled a modern boom, making baseball cards more popular and valuable than ever. OK Let’s Learn about the Business of Baseball Cards. Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

The Top 20 influential moments in the history of the month of November- we count them down from 20 to 1. OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

How did trick-or-treating become one of Halloween’s most popular traditions, and how did candy become such an important part of the celebration? We explore the origins and evolution of trick-or-treating, from its early traditions to its widespread popularity in America. We’ll also discover how major candy companies helped transform Halloween into a multibillion-dollar industry and one of the sweetest holidays of the year. Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfrReach out to us with any questions, comments or feedback Support the show

We explore the fascinating world of the giant panda, one of the most recognizable and beloved animals on Earth. Discover how these remarkable black-and-white bears survive in the mountains of China, why they depend almost entirely on bamboo, and how they became a worldwide symbol of wildlife conservation. We’ll also uncover the history of their discovery by the Western world, the remarkable story of the first giant panda brought to America, and some surprising facts about these extraordinary animals. Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

A replay of a classic episode. Hot Wheels has been one of the most popular toy brands in the world for generations, but how did it all begin?  We explore the history of Mattel, the company behind Hot Wheels, and how a simple idea revolutionized the world of toy cars. From the creation of the first Hot Wheels cars in 1968 to their rise as a worldwide phenomenon, discover the story behind these miniature racing machines and the company that created them. Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

The origins of baseball cards date back to the 1800’s, when photographs of baseball players first appeared on collectible cards and eventually became a popular way for companies to advertise their products. What began as a simple promotional idea grew into an American pastime, with generations of fans collecting, trading, and cherishing pictures of their favorite players. In this episode we’ll explore the history of baseball cards, from their earliest beginnings in the 1800’s through the rise of an exciting hobby in the 1970’s. Part 2 will be a future episode where we will focus on the rise of this hobby into the multi billion dollar business that it is today. Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfrReach out to us with any questions, comments or feedback Support the show

A replay episode about Ancient Sparta from A-Z. We trace its history back to the end of the Bronze Age with the invasion of the mysterious sea people. From 800 BC to its takeover by the Romans in 146 BC, we dive into everything that made the Spartan warrior and its society unique, different and historic.  Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

Ancient Athens was one of the most influential cities in world history, helping shape democracy, philosophy, science, art, and architecture. Discover how this powerful Greek city-state rose to greatness, competed with Sparta, and became a center of learning and culture. From its Golden Age to its eventual decline, explore how the achievements of ancient Athens continue to influence our lives more than 2,000 years later. OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

Birthdays are a time for cakes, candles, presents, and celebrations, but have you ever wondered where these traditions began? From ancient civilizations to the modern birthday party, the history of celebrating another year of life is filled with surprising stories and customs. Join us as we explore how birthdays became one of the most celebrated occasions around the world. OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show

How did an element found in ordinary sand become one of the most important materials in the modern world? Discover how silicon is used to make the tiny computer chips that power our phones, computers, and countless other devices. From the Earth’s crust to billions of microscopic transistors, we explain how silicon helped revolutionize technology and change the way we live. OK Let’s Learn! Reach out with questions, feedback and future episode suggestions: [email protected] Go to our new website- okletslearn.com Support the podcast and be named a producer of the show here at this Patreon link: www.patreon.com/okletslearn OK Let’s Learn Substack page: https://substack.com/@kevinokeefe165051?r=6vm2k&utm_medium=ios&utm_source=stories&shareImageVariant=blur OK Let’s Learn YouTube Channel: https://youtube.com/@okletslearn?si=NmO4Nqz_eu6oVYdX OK Let’s Learn Facebook page: https://www.facebook.com/share/1Bo17WByGm/?mibextid=wwXIfr Reach out to us with any questions, comments or feedback Support the show