YouTube

YouTube

How did YouTube become so popular? Get the answer in this Level 5 listening lesson.

Popcorn

Popcorn

Why did popcorn become a favorite snack in movie theaters? Why is popcorn so expensive? Get the answers in this listening lesson.

Gunpowder

Gunpowder

Gunpowder helped to change history by making armies strong and empires rich. And it was because of an accident. Learn the history of gunpowder in this Level 5 listening lesson.

Lightning

Lightning

Is lightning a line of electricity that shoots through the sky? Not really. Learn how lightning works in this Level 5 listening lesson.