Unsettling things are things that make you feel afraid or scared. They might make you feel uneasy, or they might make you feel like you're in danger.
There are many possible universes, and each one has its own set of rules and laws. It's impossible to know which universe you are living in, or what the future will be like.
The outermost is the most outer part of something. When you say that something is the outermost part of something, you mean that it is the most visible, accessible, or public part of that something.
A bubbly person is usually happy and excited. They often have a lot of energy and are very positive.
Synapses are the connections between neurons in the brain. They are responsible for transmitting signals between the cells.
Rollercoasters are amusement park rides that are designed to make you feel scared and excited at the same time. They usually have a series of hills and valleys, and they go around and around.
Absurdly is an adverb that means completely out of the ordinary. When you say something is absurdly expensive, you mean that it's much more expensive than usual.
Nothingness is a term that is used to describe something that doesn't exist. Sometimes people use the term to describe the emptiness that they feel after they have lost a loved one.