What do you use today that was invented in 1947 to pop corn warm up coffee and cook many foods?

The invention you're likely thinking of is the microwave oven. It was invented in 1947 by Percy Spencer, and today it's a staple in most kitchens.

Here's why it fits the description:

* Pop corn: Microwaves are excellent for popping popcorn quickly and easily.

* Warm up coffee: You can reheat your coffee in a microwave.

* Cook many foods: Microwaves are used to cook a wide variety of food items, from frozen dinners to vegetables.

Let me know if you had something else in mind!