This ancient mathematical trickery posits that a mighty hero cannot overtake a tortoise. Zeno of Elea (born c. 490 BCE) is the author of this and other paradoxes.

The more you think about it, the more complex time travel seems! This video explains a key paradox that is one of the main reasons for this.

John Searle's thought experiment, called "The Chinese Room," presents an argument against the idea that computers could ever be truly intelligent.

If a hotel with an infinite number of rooms has an infinite number of guests, how could it free up space when new guests arrive? Hilbert's “Grand Hotel” paradox has fascinated mathematicians, physicists, philosophers, and theologians, as it encourages another way of thinking about the notion of infinity.

How can one brother travel into space and return younger than his twin? In just sixty seconds, a startling side effect of Einstein’s Theory of Relativity is explained to us.

Schrodinger’s hypothetical experiment involved putting an unfortunate cat into a box with a Geiger counter and a vial of deadly poison. Until the box was opened, the cat could be said to be alive, or dead… or possibly in both of these states simultaneously.

Plato is considered one of Philosophy’s greatest writers. He was able to conceive of greater realities by imagining how much poorer our perception would be if we had lived our whole life as prisoners locked in a cave.

At the beginning of the classic animation A Charlie Brown Christmas, directed by Bill Melendez and based on Charles Schulz's comic strip, Charlie Brown is having doubts about the holiday season.

In a passionate monologue, Linus explains what Christmas is really all about.

The kids try to catch snowflakes on their tongues, and Linus once again proves to be wise beyond his years.

Charlie Brown and Linus have been instructed by Lucy to find a Christmas tree for a play they are going to put on, so they go searching for one.

The trolley problem is a classic thought experiment in moral philosophy. Is sacrificing one life to save the lives of many others the best possible outcome?

Mickey and Donald try to help a hapless Goofy woo the love of his life, but don't realize that love is not always what it seems.

Mickey helps Goofy by letting his grandma stay at his house, but soon finds out that she's not the sweet old lady she appears to be.

Let’s learn some colors and numbers in this simple video for beginners!

Welcome to this beginner series, in which the one hundred most commonly used words in the English language are used in context. Master them, and you will be on the way to becoming an English speaker!

In part two, we learn five more common and crucial words, and learn them in the best way possible: in context!

More simple, but very common words are used in context in part three of this series for beginners. We learn more of the most common prepositions and new conjugations of the verb "to be."

In this episode, we learn about the strong bond between Maria and her pet dog, Oscar. It takes only simple, but very important vocabulary to say, “I love you!”

Maria and Oscar have fun in the park, and we learn more of the most common words in the English language.

Maria is going out for lunch, but first she must choose which clothes to wear. She’d better hurry, or she will be late!

Maria’s mother waits all morning in the café. She will certainly have some questions for Maria, if and when she arrives!

Maria arrives at the café covered in mud, but her mother is unsympathetic about her bad luck. As it turns out, she has a surprise in store for Maria!

Maria’s mother has a surprise... she’s found a nice young man that she’d like Maria to meet! Maria really doesn’t know what to do.