Herman Rorschach (no, not the guy from Watchmen) came up with the eponymous tests, but what do they mean? Why are we so fascinated with them despite the division in the world of Psychology? Hank tackles these topics as we take a...

Aunque a veces no parezca posible, la Tierra está cambiando constantemente. Este video ofrece información sobre procesos fascinantes como la formación de la tierra, la erosión y las erupciones volcánicas. También se investigan otros...

For thousands of years, a sea creature has plagued sailors by attacking and devouring their ships. It is so destructive that reportedly it swiss-cheesed the hulls of Christopher Columbus’s ships, sinking at least two of them.

Whether it’s micromanaging playtime, constantly hovering or incessantly texting, the adult takeover of childhood has created a crisis of anxiety in both children and parents, says Lenore Skenazy, cofounder and president Let Grow, an...

What makes us giggle and guffaw? The inability to define comedy is its very appeal; it is defined by its defiance of definition. Addison Anderson riffs on the philosophy of Henri Bergson and Aristotle to elucidate how a definition draws...

The building blocks of all natural numbers are the prime numbers. The early Greeks invented the system still used today for separating natural numbers into prime and composite numbers.

Our modern decimal number system is base-10. Other number systems used in fields like computer engineering are base-2 (binary), base-8 (octal) and base-16 (hexadecimal).

Number systems evolved from the natural "counting" numbers, to whole numbers (with the addition of zero), to integers (with the addition of negative numbers), and beyond. These number systems are easily understood using the number line.

When working with fractions, division can be converted to multiplication by the divisor's reciprocal. This chapter explains why.

Sometimes arithmetic operations result in fractions greater than one, called "improper" fractions. An improper fraction can be converted into a "mixed number" composed of an integer plus a "proper" fraction.

Exponential expressions with divided terms can be simplified using the rules for subtracting exponents.

Any fraction can be converted into an equivalent decimal number with a sequence of digits after the decimal point, which either repeats or terminates. The reason can be understood by close examination of the number line.

Sometimes when finding a common denominator we create an unnecessarily large common denominator. This chapter explains how to find the smallest possible common denominator.

Integer exponents greater than one represent the number of copies of the base which are multiplied together. But what if the exponent is one, zero or negative? Using the rules of adding and subtracting exponents, we can see what the...

Radical expressions can often be simplified by moving factors which are perfect roots out from under the radical sign.

The commutative property is common to the operations of both addition and multiplication and is an important property of many mathematical systems.

Exponential expressions with multiplied terms can be simplified using the rules for adding exponents.

Todays episode features a scathing response to possibly the most ill advised “take me back” letter ever and some wisdom from an ancient African proverb. The response came from a formerly enslaved man named Jourdan Anderson, who lived...

Sarah Kay reads Forest Fires, a poem she wrote for her grandmother and dad.

MOT 1952: CAIRO, EGYPT: WS General Muhammad Naguib (1901-1984) sitting at desk in Prime Minister's office w/ unidentified aide, MS General Naguib SOT saying no political ambitions, anxious to restore democratic government, rid...

MOT 1947: LOMBARDY GARMENT MASS PRODUCTION: INT WS Men laying cloth on long table. HA WS Men cutting patterns into cloth. MS Tracing pattern. VS Men using cloth cutters to cut patterns. NYC

SchoolOnline's Secondary Maths videos are brilliant, bite-size tutorial videos delivered by examiners. Ideal for ages 13-17, they cover every key topic and sub topic covered in GCSE Maths in clear and easy to follow...

Marketing - Benefits of Publicity

What Is PCSing? - Permanent Change Of Station // One of the benefits of military life is the unique opportunity to experience life in different parts of the country and the world. A permanent change of station, or PCS, is a fact of life...