Beginning around 1377, medieval England was shaken by a power struggle between two noble families, which spanned generations and involved a massive cast of characters, complex motives and shifting loyalties. Sound familiar? Alex Gendler...

Taylor series are extremely useful in engineering and math, but what are they? This video shows why they're useful, and how to make sense of the formula.

The answer lies in the weirdness of floating-point numbers and the computer's perception of a number line.

After 14 years of going unnoticed, a vulnerability in Wi-Fi security was published last week. It's a serious problem, but it's already in the process of being fixed.

Ever wonder how the heart symbol came to stand for the actual heart? And why do we speak of the heart as the seat of love, when love really happens in our brains? Is it true that animals only get a billion heartbeats? This week, we give...

Just because there are four dimensions doesn't mean there's a "fourth dimension"

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.

Howcast - Make your own Fourth of July Hat everyone will envy with only a few simple items.

Howcast - Let musician Alex Skolnick teach you how to use drop B tuning in this heavy metal guitar lesson from Howcast.

When you first learn to play guitar, you'll be strumming some pain with your fingers. But it's the only way to start.

Pupil outcome: I can say ordinal numbers and use them to describe position. Key learning points: - Know the ordinal number names are first, second, third, fourth and fifth. - Know that ordinal numbers can be used to describe position in...

What will be the blood type of the probable progenies of blood type AB and blood type O parents? Let's solve this problem in the scenarios below: What will be the phenotype from a father with heterozygous type A, and a mother with...

Do you need to learn how to subtract mixed numbers with different denominators? In this video, I will show you how to subtract a pair of mixed numbers with different denominators. I will show you the process of finding a common...

Mr. Addit reviews multiples and how to multiply 2 and 3 digits by one digit.

Mr. Addit explains mixed numbers and how frequently we use them. He also begins the discussion of improper fractions.

Mr. Addit shows how to use number lines and fractions strips to compare fractions.

“Equivalent Fractions” reviews the meaning of the word equivalent and demonstrates how to use multiplication to create equivalent fractions.

Mr. Addit introduces the terms mixed numbers and improper fractions. He then demonstrates the method for converting improper fractions into mixed numbers.

Learn the ordinal numbers with our friends

We find Miss Palomine standing on the mall in Washington, DC She tells the story of how the British once ruled America. She explains that the Declaration of Independence was signed on the 4th of July. That’s the day America first became...

Using two different lines as examples, Miss Palomine demonstrates positions from first to tenth. The student describes the position of objects using ordinal numbers.

Today we are going to write a harmony using mostly seventh chords and we will look at a strategy to deal with non-chord notes when we are writing music. This combines a couple of our past lessons so be sure you watched those videos...

Things get weird at infinity

1405 - The Year England was Nearly Destroyed | Medieval England, Owain Glyndwr, Plantagenets... etc.