Does anyone know what a bubble is?

A bubble is air surrounded by a wall of water. Every bubble I make has three layers. Two layers of bubble solution with a layer of water in between. Water has surface tension. Surface tension is what holds that bubble together and it also pulls it into a sphere. That perfectly round shape is the most efficient shape possible because it has the least amount of surface area of any possible shape.

Where do you find bubbles?

In a lake? In a stream? In your sink or a toilet? Bathtub? Puddle?

How about in bread? Are bubbles what make bread light and fluffy?

Soda? How do those bubbles get there?