A beautiful proof of why slicing a cone gives an ellipse.

A beautiful proof of why slicing a cone gives an ellipse.

On today’s episode...CATS. Also: Hank talks about some philosophy stuff, like a few of the key concepts philosophers use when discussing belief and knowledge, such as what defines an assertion and a proposition, and that belief is a kind...

What exactly makes a poem - a poem? Poets themselves have struggled with this question, often using metaphors to approximate a definition. Is a poem a little machine? A firework? An echo? A dream? Melissa Kovacs shares three recognizable...

If Fermat had a little more room in his margin, what proof would he have written there?

Today Hank brings us the news of a unique astronomical discovery - a rogue planet. He also allays our fears of an apocalyptic collision with Earth. So, this new planet is awesome, but it needs a different name - CFBDSIR...

In today's Crash Course Astronomy, Phil takes a look at the explosive history of our cosmic backyard. We explore how we went from a giant ball of gas to the system of planets and other celestial objects we have today.

First thing’s first: what is media literacy? In our first episode, Jay breaks this question down and explains how we’re going to use it to explore our media saturated world.

What are limits? How are they defined? How are they used to define the derivative? What is L'Hospital's rule?

Welcome to Crash Course Theater with Mike Rugnetta! In this, our inaugural week, we're going to ask the two classic questions about theater. 1.What is theater? And 2. Is it spelled -re or -er? Well, there's a clue to question two in the...

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...

In this video, the speaker explores the fascinating world of "ghost words" - words that made it into dictionaries but were never actually used. They discuss the origins and stories behind these ghost words, from Samuel Johnson's mistaken...

How much risk will your project take on? There are three similar measures we use. I want to explore the comparisons between: Risk Tolerance, Risk Appetite, and Risk Capacity.

Here’s a breakdown of common burndown chart anti-patterns. These are patterns can signal deeper issues in team performance, estimation, or process adherence. The list includes 7 anti-pattern signals, what causes each of them, and how to...

In this video I am going to explain how to set up and solve a proper percentage word problem.

Abnormal is a word with a lot of stigma about it in general conversation. In psychology, it's used with specific meanings. This video outlines four criteria by which someone might be considered to be functioning abnormally.

In this video, gain an overview of WAN technologies and how they differ from LANs.

These are the top 10 countries threatened by the 6 meter sea level rise we are almost guaranteed to see in the not-too-distant future, according to the projected pace of global warming and ice melt in Greenland and Antarctica.

This video provides valuable tips on how to decipher unfamiliar words by utilizing context clues. By examining the surrounding words and phrases in a sentence, such as definition clues, synonym clues, antonym clues, and example clues,...

This video, entitled "Confused Words," explains how to tell homophones, or words that sound the same, apart.

This video emphasizes the importance of utilizing reference materials to enhance vocabulary skills. By exploring definitions, pronunciations, parts of speech, etymology, and synonyms/antonyms, individuals can deepen their understanding...

When is yoga religious, and when is it… not religious enough? In this episode of Crash Course Religions, we’ll find out why these frameworks we call “religions” are so hard to define, and why our definitions have real-life consequences.

If you are looking to get toned glutes, bridge is your best option

Howcast - Learn if cheerleading is a sport from UCA instructor Ashley Cowan of Varsity.com in this Howcast video.