Are you ready to think fast again? You've got this! You get four seconds to come up with each answer. Then repeat the video to make sure you really know all the words!

Sigrid describes an object and gives you about 4 seconds to come up with the name of the object. Then she gives you the answer. Watch the video twice to see if you can come up with the answer on your own.

Do you know how to say the colors in English? What is the difference between a primary and secondary color? Learn all about them with Luana.

How does a volcano actually form? This informative video on the topic is brought to you by National Geographic Kids!

Cheryl teaches the iconic choreography from the music video for her song "Promise This," in particular focusing on the moves from the song's chorus.

Let Sigrid tell you about the solar system that resolves around the Sun, including the order and characteristics of the planets within it. What is the closest planet to the Sun? What are the smallest and largest planets?

In this lesson, we'll talk about the weather in the future. One way to express the future is with "going to": "It's going to rain." The second way is with "will": "It will rain." You will hear both in this video, so keep your eyes and ears open!

This time, let's talk about the weather in the past using nouns, verbs, and adjectives. If we use the past tense, we can talk about yesterday, last week, last month, or even last year.

There's more than one way to talk about the weather. In part 1 of this lesson, we talk about it in the present. We use nouns, verbs, and adjectives to describe the weather.

There is a lot of talk about how 3D printing could revolutionize the way that we make stuff. But what is 3D printing and how does 3D printing allow us to make almost anything from nothing? Professor Tim Minshall, Head of the Institute for Manufacturing at the University of Cambridge, explains it in this video, which is targeted at school-age students.

What exactly is it that makes Yabla such a fun and effective language learning tool? Amy explains what she enjoys about using Yabla, and how we can gain the most from the experience.

When we talk about traffic, it's not only about cars and trucks. We can talk about people on bicycles or on foot, too. They have some special rules to follow, especially in the city.

Many of us have to deal with traffic on a daily basis. Here's how to talk about it in English, include expressions such as "traffic jam," "bumper-to-bumper," and "bottleneck."

Sometimes it's hard to know how to pronounce the "-ed" ending of a regular verb in the past tense. Here are plenty of examples, taken from the story of the Ugly Duckling.

In order not to forget anything, Luana and Austin have made a list of the clothes and other items they need to pack. Austin reads the list while Luana gathers the items, and then they discuss their strategy for getting to the airport on time.