Knowledge: Butter has been in existence for thousand of years but the exact timeline is difficut to determine while cheese-making dates back to over 7000 years.

Conversation:
Are you a fan of cheese? There are so many ways to enjoy it.
Yeah, Cheese is a type of food that is  derived from milk and formed by the coagulation of a protein
I love grilled cheese and cheese pizza. There's even vegan cheese for people now!
Cheese is produced in a wide range of flavors, textures, and forms by coagulation of the milk protein casein.
That's interesting. For how long has cheese been in existence?

Response: The history of cheese-making goes as far back as 7000 years ago.