What are parallel universes?

Imagine you have two toy boxes that look exactly the same from the outside, but inside, they’re full of different toys. That’s like parallel universes: places that are just like ours, but with some fun changes.

Think about your bedroom as one universe. Now imagine there's another room in the house that looks just like yours, same bed, same closet, same favorite dinosaur on the wall, but you have a robot friend instead of a dog! That other room is like a parallel universe: it's similar to ours, but with some cool differences.

Sometimes, when you're playing with your toys, you might find a secret door that leads to another room, just like how scientists think people might one day travel between parallel universes. It’s like having many versions of yourself, each living in their own special room. Some rooms have different colors, some have more candy, and some even have flying pigs!