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In 1903, US President Theodore Roosevelt took a camping trip in California's Yosemite Valley with conservationist John Muir. Roosevelt famously loved the outdoors, but Muir had invited him for more than just camping: Yosemite was in danger. It was part of a struggle to set aside land for both preservation and public use.

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While the concept of a dictionary dates back to ancient civilizations, the first English dictionary wasn’t published until 1604. In the centuries that followed, many more dictionaries were written by individual authors who chose what to include or exclude, with most quickly becoming outdated. One 19…

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Rod Phillips: A brief history of divorce

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Formally or informally, human societies across place and time have made rules to bind and dissolve couples. The stakes of who can obtain a divorce, and why, have always been high. Divorce is a battlefield for some of society's most urgent issues, including the roles of church and state, individual rights, and women's rights.

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Iseult Gillespie: Frida Kahlo: The woman behind the legend

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In 1925, Frida Kahlo was on her way home from school in Mexico City when the bus she was riding collided with a streetcar. She suffered near-fatal injuries and her disability became a major theme in her paintings. Over the course of her life, she would establish herself as the creator and muse behind extraordinary pieces of art.

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Titan of terror: the dark imagination of H.P. Lovecraft

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Titan of terror: the dark imagination of H.P. Lovecraft

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Silvia Moreno-García: Titan of terror: the dark imagination of H.P. Lovecraft

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Arcane books of forbidden lore, disturbing secrets in the family bloodline, and terrors so unspeakable the very thought of them might drive you mad. These have become standard elements in modern horror stories. But they were largely popularized by a single author: H.P. Lovecraft, whose name has become synonymous with the terror he inspired.

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It may seem like the semicolon is struggling with an identity crisis. It looks like a comma crossed with a period. Maybe that's why we toss these punctuation marks around like grammatical confetti; we're confused about how to use them properly. Emma Bryce clarifies best practices for the semi-confusing semicolon.

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Karlos Hill and Soraya Field Fiorio: What is Juneteenth, and why is it important?

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At the end of the Civil War, though slavery was technically illegal in all states, it still persisted in the last bastions of the Confederacy. This was the case when Union General Gordon Granger marched his troops into Galveston, Texas on June 19th and announced that all enslaved people there were officially free.

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Christina Greer: Notes of a native son: the world according to James Baldwin

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In the 1960s, the FBI amassed almost 2,000 documents in an investigation into one of America's most celebrated minds. The subject of this inquiry was a writer named James Baldwin, one of the best-selling Black authors in the world at the time. What made him loom so large in the imaginations of both the public and the authorities?

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Armand D'Angour: The ancient origins of the Olympics

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Thousands of years in the making, the Olympics began as part of a religious festival honoring the Greek god Zeus in the rural Greek town of Olympia. But how did it become the greatest show of sporting excellence on earth? Educator Armand D'Angour explains the evolution of the Olympics.

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Michael Molina: What is déjà vu? What is déjà vu?

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You might have felt it -- the feeling that you've experienced something before, but, in reality, the experience is brand new. There are over 40 theories that attempt to explain the phenomenon of déjà vu. Michael Molina explains how neuroimaging and cognitive psychology have narrowed down the theories that could explain that feeling you're having...again.

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After a week of studying, you feel confident that you’ll ace your exam. But when you get your grade back, it’s much lower than you expected. You’re devastated, and the disappointment is hard to shake. Should you be trying to look on the bright side? And is controlling your emotions even possible? Explore techniques to help you identify, understand, and regulate your emotions. [Directed by Daniel Stankler, narrated by Jack Cutmore-Scott, music by Zing Audio].

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The ingredient in almost everything you eat

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The ingredient in almost everything you eat

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Pumpkin season has officially begun! Skunk Bear teaches us some fun facts about America's favorite decorative gourd.

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Jacques S. Abramowicz: How does ultrasound work?

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In a dark cave, bats can't see much. But even with their eyes shut, they can navigate rocky topography at incredible speeds. This is because bats aren't just guided by their eyes, but rather, by their ears. It may seem impossible to see with sound, but bats, naval officers, and doctors do it all the time.

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Jessica Smith: Mansa Musa, one of the wealthiest people who ever lived

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Mansa Musa, the 14th century African king of the Mali Empire, is said to have amassed a fortune that possibly made him one of the wealthiest people who ever lived. Jessica Smith tells the story of how Mansa Musa literally put his empire - and himself - on the map.

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Kevin Ehrman-Solberg and Kirsten Delegard

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Kevin Ehrman-Solberg and Kirsten Delegard: The dark history of the suburbs

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Beginning in the 1800s, people began writing clauses into property deeds that were meant to prevent all future owners from selling or leasing to certain racial groups, especially Black people. These racial covenants spread like wildfire throughout the US, making cities more segregated and the suburbs more restricted.

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Systemic racism affects every area of life in the US. From incarceration rates to predatory loans, and trying to solve these problems requires changes in major parts of our system. Act.tv takes a closer look at what systemic racism is, and how we can solve it.