Reasonable doubt is a concept that is thrown around in a criminal case, but what does it really mean?

The best example we can think of is this: If you put a cat in a room, along with a box with a mouse in it and leave for one hour and the mouse is gone, can you say beyond all reasonable doubt that the cat ate the mouse?

Well, the answer would be no if the box had a hole in it, or if the cat knocked the box over and the cat escaped, or if the room wasn’t absolutely sealed to where the mouse couldn’t hide or escape. The only circumstance where you could say, yes, beyond all reasonable doubt the cat ate the mouse is if the box was completely sealed, and the cat could easily get into the box, and that there was no possible way the mouse could have hidden or gotten out of the room. Otherwise, there is reasonable doubt if the cat ate the mouse.