The History of Ketchup

The History of Ketchup

How much do you know about the ketchup on your fries? Listen to the Level 4 lesson and learn how ketchup started as a fish sauce.

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.