What is torque? This is one of those things that you may have heard about in passing but never really understood. In this episode of Crash Course Physics, Shini sits down with us to discuss what torque is, how it works, why it works, and...

Lemmings are small, thickset vole-like animals that live in the Arctic tundra. They live in a harsh environment, are super-cute, kinda mean, and totally misunderstood.

Your rich, eccentric uncle just passed away, and you and your 99 nasty relatives have been invited to the reading of his will. He wanted to leave all of his money to you, but he knew that if he did, your relatives would pester you...

The determinant has a very natural visual intuition, even though it's formula can make it seem more complicated than it really is.

A primer on exponential and logistic growth, with epidemics as a central example

Flowers tend not to own calendars, so how do they know when to bloom?

In February of 1942, Mexican farmer Dionisio Pulido thought he heard thunder coming from his cornfield. However, the sound wasn't coming from the sky. The source was a large, smoking crack emitting gas and ejecting rocks, and would come...

We hear about calories all the time: How many calories are in this cookie? How many are burned by doing 100 jumping jacks, or long-distance running, or fidgeting? But what is a calorie, really? And how many of them do we actually need?...

Researchers have made some unexpected readings of mysterious particles called muons, which may make us reexamine the Standard Model in physics.

So, how many different kinds of intelligence are there? And what is the G-Factor? Eugenics? Have you ever taken an IQ Test? All of these things play into the fascinating and sometimes icky history of Intelligence Testing. In...

Your mortal enemy has captured you and hooked you up to a bizarre experiment. He's extended your nervous system with one very long neuron to a target about 70 meters away. At some point, he's going to fire an arrow. If you can then think...

So, why doesn't the moon just crash into the Earth? And why doesn't the Earth crash into the Sun? What are orbits exactly and why do they happen? Well, it has to do with gravity and velocity. In this episode of Crash Course Kids, Sabrina...

Only 4 steps stand between you and the secrets hidden behind RSA cryptography. Find out how to crack the world's most commonly used form of encryption.

New ReviewIn this lesson, students will learn how to simplify and factor linear expressions that involve multiple operations. We begin with a clear procedural checklist: 1️⃣ Rewrite subtraction as addition if necessary 2️⃣ Distribute to remove...

New ReviewIn this short math video, students learn how to factor a quadratic by grouping using a clear, five-step process. The lesson begins by reviewing the standard form of a quadratic, and then models each step carefully so students can follow...

New ReviewIn this short math video, students learn how to multiply two numbers written in scientific notation using a clear, step-by-step process. We begin by reviewing that scientific notation expresses a value as a factor multiplied by a power...

New ReviewUnderstand how multiplication and area are related is very helpful to understanding the factoring process

New ReviewIn this video we will cover how to identify an example of easy medium and hard examples of factoring down a polynomial to it's linear factorization.

New ReviewHow do you know when simplifying a rational expression if you have a hole or an asymptote? What does it look like algebraically and graphically?

New ReviewIn this video I am going to work through the differences of finding the zeros between a quadratic, cubic and quartic binomial by factoring.

New ReviewWhen factoring when a=1 there is a couple of ways we can approach the topic. In this video I will provide a couple of different methods

New ReviewIn this video I will show you how to factor a quadratic in your head when a is not equal to 1

New ReviewLets take a look at how to factor quadratics when a=1 using easy medium and hard numbers

New ReviewLet's start with a basic factoring technique which is factoring out the GCF of binomials. We are looking for common factors of each term that we can "factor" out so we can rewrite the expression as a product.