This episode of "Think Fast" is dedicated to the summer and the heat. Try to guess what Sigrid is describing!

What is the passive voice all about? Sigrid takes us through the basics, step by step. In the active voice, we focus on "who" does something and in the passive voice we focus on "what" someone does.

Let’s learn some colors and numbers in this simple video for beginners!

This segment is about the sense of smell and the sense of taste. When it comes to the five senses, every language seems to have some quirks, and English is no exception. For example, we use the same verb — "to smell" — to talk about perceiving an odor ("I smell the lemon") and giving off an odor ("The lemon smells delicious").

Every day, we get information from lots of different sources. But how do we know what is true and what is "fake news?" In this 3-part series we explore different kinds of information and misinformation.

The senses of sight, hearing, touch, taste, and smell are essential in experiencing the world around us. Let's consider them one by one and learn how to use them in conversation. We start with "sight" and "hearing."

Try to guess what word Sigrid is describing using the clues she gives you. Remember: You can always click "pause" if you need more time!

On the Side by Side talk show “People Around the World," we meet people of different nationalities, ask what languages they speak, and what they like to do with their time.

See if you can figure out what Sigrid is describing. Don't worry! She will give you a little time to think and then give you the answer (with some extra information, too).

In this video lesson, Luana explains the names given in English to our nearest and dearest relations: the brothers, sisters, cousins, parents, uncles and aunts that make up our family tree.

Luana guides us through some of the most common questions asked at job interviews, and gives us useful tips on how we might answer them, if we want to get that job!

In this video, Sigrid talks about the different types of two-dimensional shapes and some basic geometry.

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.