- All Lessons
- Staff Picks
- Pocket Perfect
- Sunset Magazine
- Curious 52
- Art & Photo
- Game On
- Green Thumb
- Smarty Pants
- Fit & Active
- Tasty Treats
- Song & Dance
- Health & Beauty
- Kids Only
- Business Savvy
- Party Time
- Great Outdoors
- Learn to Code
- Around the House
- Fancy Free
- Under 5 Minutes
Do we have free will, or do we just boil down to particles following the laws of physics? Professor Massimo Pigliucci from Plato Footnote leads us into a world where science and philosophy collide by discussing the concept of reductionism. This lesson also includes an explanation of the difference between ontological and epistemological reductionism, and how these debates come to bear on ideas of emergent properties, morality, and free will.
Is there a universal morality? And if so, is it determined by a higher god or gods? Professor Massimmo Pigliucci of Plato Footnote gives you Plato's perspective by introducing you to the story of Euthyphro's dilemma. Do the gods determine what is good? Or do they simply recognize goodness? This moral question first was posed thousands of years ago, but debate still rages today.
One of the most universally frustrating parts about math is working with negative numbers. Join Eric Buffington to learn the ins and outs of adding integers. This lesson includes examples with adding negatives, variables, replacement sets, inequalities, and absolute values. Once you've mastered adding negative numbers, check out Mr. Buffington's lessons on subtracting, multiplying and dividing negative numbers!
Never struggle with multiplying fractions again. In this quick and easy math lesson, Eric Buffington explains how to multiply several different kinds of fractions and get a simplified answer by reducing to lowest terms. You’ll also learn how to work with variables and negative fractions and cement your knowledge with several practice problems.
You’ve already learned how to add and subtract fractions; but can you apply your skills to word problems? This lesson, the final part of a three-part series, breaks down three word problems that require you to find the least common multiple (LCM), add or subtract fractions, and reduce the answer to lowest terms. Each step is clearly explained and demonstrated so that you can solve similar questions on your own.
Want to compare, add, or subtract fractions? To complete any of these operations, you need to find a common denominator. In this quick and easy math lesson by Eric Buffington, learn how to find the least common multiple (LCM) and put two fractions on a level playing field. Finally, test your skills with several practice problems.
Adding and Subtracting Fractions is the most difficult of the operations. In this lesson we go over, in a visual way, the basics of adding or subtracting fractions, then practice practice practice.
You already know how to multiply fractions; what about division? In this basic math lesson, Mr. Buffington shows you a quick trick with reciprocals to help you divide fractions without a calculator. You’ll also work with negative fractions to practice your understanding of operators and their effect on a number’s positive or negative value.
A replacement set is a group of numbers that is substituted into an equation or expression to achieve a mathematically correct statement. In this lesson by Eric Buffington, learn how to write out replacement sets, solve equations using a predetermined series, and write out answers when more than one number is correct.
Chili peppers often appear in salsas and other dishes, and add a heat that you might love or hate. But do you know why chili peppers are hot? After all, they are a fruit—what could be the evolutionary benefit of making someone blush and sweat, or setting their heart racing? In this chemistry lesson, learn about the varying heat levels of peppers, the chemical reactions behind the hot and painful sensations they produce, and why high levels of heat can mean protection for a pepper plant.
In part two of a three-part series, Eric Buffington breaks down several practice problems for adding and subtracting fractions and reviews reducing fractions to lowest terms. Whether you have never worked with fractions before or you want to brush up on old skills, this lesson has got you covered. Note: you’ll need to know how to reduce fractions to lowest terms and find the lowest common denominator.
Have you ever struggled to know what gets done first in a math problem? This lesson outlines the correct order of operations, and many of the common challenges and mistakes people make when trying to solve math problems. Tackle your next math problem with the right strategy - and you'll have an easy time knowing when to add, subtract, multiply, and divide for the correct answer.
In this lesson by Eric Buffington, learn how to solve algebraic equations that involve fractions. Whether you need to add, subtract, multiply, or divide, the process is just a combination of basic math skills. Get started with a few practice problems. As a bonus, you’ll learn about the property of equality and improve your understanding of equations.
From the basics to multi-step equations, this lesson explains how to solve square root equations - and shows several examples to get you familiar with the process. Keep an eye out for some hints that will help with all square root questions that you may encounter.
Everyone loves having choices in life. In this lesson, learn two methods for solving equivalent fractions with variables and choose the method you like best! After you pick your favorite method, Mr. Buffington provides a few practice problems so that you can cement your knowledge of this important skill.
Use science to topple a whole industry from the comfort of your home! With these two simple experiments using household items (well, also pipettes and homeopathic acid), debunk myths and attain supreme know-it-all status by proving homeopathy wrong. See how nitric acid should react with copper (ie: explosively), and then compare it with homeopathic nitric acid's reaction. Also, create a homemade pH indicator from cabbage and hot water and test the homeopathic acid yourself.
In the anarchic world of international relations, how can we predict and explain outcomes? In this lesson, William Spaniel applies game theory, a methodology created to study economic interdependence, to political science. With simple mathematical models, you too can turn assumptions into predictions of action in global politics.
Sandro Botticelli's "The Birth of Venus" is more than just a pretty picture — it's a historical artifact through which we can explore Neo-Platonism, naturalism versus idealism, and a possible reinterpretation of Eve in the Garden of Eden. In this lesson, learn how this legendary painting, commissioned by the Medici family, bent the conventions of Renaissance painting and paid homage to classical and Medieval traditions.
Did you know that Saint Patrick was actually British? What about the fact that he was once a slave, and escaped to study and become a bishop? Or that his given name was actually Maewyn Succat? In this lesson from Jeremiah Warren, unleash your inner Irish by learning all about the life and legends of the man who spent thirty years travelling Ireland converting pagans to Christianity.