One way to prepare for Halloween is to make a jack o' lantern. In this segment, Sigrid explains what a jack o' lantern is, and how kids and adults celebrate Halloween.

The pumpkin is ready to carve out. Sigrid explains that pumpkins are indeed an edible type of squash and not just for making into jack o' lanterns. In fact, one pumpkin can become both a pumpkin pie and a jack o' lantern.

Sigrid finishes carving her pumpkin and places the candle inside so we can see the final effect of the jack o' lantern. Happy Halloween!

For so many of us, life has changed radically. We've had to learn new habits because of the coronavirus pandemic. Here are some of the changes we are having to make.

Everyone should stay home as much as possible to keep the coronavirus from spreading, but sometimes we have to go out for essential errands. What are some items to have on hand when we go out? Sigrid talks about five of them.

What a time to be learning English! Things are happening quickly in the United States and history is being made right now, so don't miss out on the words and expressions you need to know.

We keep seeing the "Black Lives Matter" slogan all around — what's it all about? Well, it's a long story. Here's part of the story in a nutshell.

Lots of English words can serve as nouns, verbs, or adjectives depending on the context. Sometimes even the pronunciation changes. Let's look at the slogan "Black Lives Matter" in both a grammatical and historical context.

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.

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!

It's time to think fast again! This time it's a little harder, but focus on the words you know or recognize, and you might be able to guess the answer, even if you don't know the exact word in English. If you don't get all the answers, just watch the video again!

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).

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!

In this game, following the description is just as important, if not more important, than guessing the answer in English. Try visualizing what Sigrid is describing. You can also give yourself more time by hitting "pause" while the clock is ticking.

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