Annette offers an array of ways to greet people, from sunup to bedtime. Ways of greeting people vary from place to place, but Annette provides one general rule — greetings must be cheerful and friendly.

Fracking is a controversial topic. This animated video tries to take a neutral look at fracking. It is relevant for all of us, because of high prices for energy and the danger to our drinking water.

Let's look at the results of the meeting. Was it a good example of teamwork or not?

In this video, Sigrid looks at certain kinds of questions in which it is correct to use "some," the dreaded double negative, and negative statements that can be expressed in two different ways.

Here's a business meeting where not everyone has the same opinion. Even if you can't understand every word, try to grasp some of the expressions the speakers use to agree or disagree.

Some and any both refer to an unspecified quantity, but they are used in different situations. Sigrid explains how they work.

Bob Dignen introduces the topic of decision-making in international companies, and the various approaches to this.

Sigrid explains the meaning of "prop" as both a noun and a verb. Either one can come in handy.

The narrator explains how the breathtaking rock formations of Antelope Canyon came to be, and why mountains around the world can provide a metaphor for human existence.

In American schools, it's common for kids to have to learn the Preamble to the United States Constitution by heart. This song, from Schoolhouse Rock, is meant to give these kids a hand, even though it is a slightly abridged version.

Here are some words to help answer the question "Which one?" We distinguish between singular and plural as well as between something close to us and far away.

This song was written and sung by Bob Dorough. It teaches about the multiplication of 5 through a game of hide and seek, in which the seeker counts by fives.

Why are some rock formations and animals found on more than one continent? The explanation dates back to the Ice Age.

Why do some of the national parks in the United States resemble the European Alps? Geologist Dr. Robert Darga answers this question.

When an invitation arrives for the previous occupant of Ted's apartment, the gang decides to attend the event in her place.