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.

Ballpoint Pen

Ballpoint Pen

Around the world, 57 ballpoint pens are purchased every second. How did this simple pen become so popular? Get the answer in this Level 5 listening lesson.

Galileo

Galileo

Galileo was a scientist who wanted to understand the world with evidence and proof. Learn about his work and ideas in this Level 5 listening lesson.

Potato Chips

Potato Chips

Potato chips are a popular snack. This Level 5 listening lesson gives you the short history of this tasty treat.

The History of Salt

The History of Salt

Salt is the only rock people eat. Surprising, it’s played an important role in world history. Learn more about this tasty mineral in this Level 2 listening exercise.