In this video Paul Andersen explains how Newton's Second Law applies when a net force acts on a body. The net force vector and the acceleration vector will act in the same direction. If an object acts on another object in a system the...

In this video Paul Andersen explains how the bond length and bond energy are calculated using an energy distance graph. The strength of the bond is determined by the charges in the constituent atoms. As the charge increases the bond...

How many stars are there in the universe? This question leads Hank to a couple other questions - How many stars can we see from Earth? How many stars are there in our galaxy? - but the answer to the original question proves elusive.

Obesity is an escalating global epidemic. It substantially raises the probability of diseases like diabetes, heart disease, stroke, high blood pressure, and cancer. But what is the distinction between being overweight and being obese?...

You've found Leonardo da Vinci's secret vault, secured by a series of combination locks. Fortunately, your treasure map has three codes: 1210, 3211000, and. . . hmm. The last one appears to be missing. Can you figure out the last number...

Does your toilet water drain differently than in the other hemisphere? Is it because of the Coriolis effect? Hank has some things to clarify about these questions, and more in this edition of I Don't Think It Means What You Think It Means.

In this video Paul Andersen explains how the strong nuclear force holds the nucleus together in spite of repulsive electrostatic charges acting on the nucleons. Mesons exchanged between nucleons keep the nucleus intact and gluons...

In this video Paul Andersen explains how a vector field shows the distribution of vector quantities. In AP Physics 1 student should be able to map and understand gravitational vector fields. In AP Physics 2 students should be able to...

Sabrina gets a new set in this episode of Crash Course Kids. Do you want to be an astronaut? Would you like to someday walk on the moon? Well, you better learn a little about gravity so you can escape from Earth and head into space....

Meet Lucy. She was a math major in college, and aced all her courses in probability and statistics. Which do you think is more likely: that Lucy is a portrait artist, or that Lucy is a portrait artist who also plays poker? How do we know...

In this video Paul Andersen explains for the position of an object over time can be used to calculate the velocity and acceleration of the object. If a net force acts on a object it will experience an acceleration.

In this video Paul Andersen explains how resistors and capacitors affect circuits. The resistance of a resistor is affected by the resistivity of the material and the geometry of the resistor. The current through a resistor can be...

In this video Paul Andersen explains how current moving through a wire will generate a magnetic field tangent to the wire. As the current increases the magnetic field will increase and as the radius from the wire increase the magnitude...

In this video Paul Andersen will first define momentum as the product of an objects mass and velocity. He will then demonstrate how a net force acting on an object will change the momentum in the direction of the force. Several...

In this video Paul Andersen explains how intermolecular forces differ from intramolecular forces. He then explains how differences in these forces account for different properties in solid, liquids and gases. Some of these properties...

In this video Paul Andersen talks about the impacts of human growth on the environment and on themselves. The population, affluence, and destructive technology of a population impact the environment according to the IPAT equation. An...

New ReviewGunners got a huge boost in the Premier League title race as results went their way.Source: Miguel Delaney / The Independent

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 ReviewIn this math video, we will learn how to write an AND compound inequality that represents a number line graph. Students will review how open circles show less than or greater than (not inclusive), while closed circles show less than or...

New ReviewIn this math video, we will learn how to write a compound inequality that represents a given number line graph. Students will review how open and closed circles communicate the meaning of less than, greater than, less than or equal to,...

New ReviewWhen graphing piecewise functions there are some great tips that I want you to follow. This video will explain all.

In 2012, the American Academy of Pediatrics published a policy statement in which they said that the benefits of male circumcision outweighed the risks of the procedure. They cited health benefits which, while not great enough to warrant...

In this shorts video we will learn about inequalities & when to reverse the symbol. We will review properties of inequality used to solve linear inequalities. We will review the rule for multiplying or dividing both sides of an...

In this short math video we will understand place value & rounding rules. We are asked to round to the nearest ten thousand. We will review rounding rules and understand that we look at the digit to the right of the place value we are...