Essential vocabulary for:  https://www.youtube.com/watch?v=ha1ZbJIW1f8

Understand dopamine and motivation.

The resistance that one surface or object encounters when moving over another.

More than one, several, or of different kinds.

To move or cause to move from one place to another.

Attractive or pleasing in a way that holds attention.

Continuously over a period of time; always.

A metal part that lets a door swing open or closed.

In conflict or competition with; against.

Misuse; treating someone or something badly or harmfully.

A type of narcotic drug used to relieve pain.

Allowing oneself to enjoy the pleasure of something.

To touch lightly so as to cause laughter or twitching movements.

The action of following or pursuing something.

More and more; to a greater degree over time.

Closeness in space, time, or relationship.

A feeling of reassurance and relaxation following release from anxiety or distress.

A large organ in the body that processes toxins and produces bile.

To allow or cause to move, act, or flow freely.

The boundaries or limits of a place or thing.

Of or concerning the part of the mind of which one is not fully aware.

Food and drink regarded as a source of strength; nourishment.

More than necessary, normal, or desirable.

Rising and falling irregularly in number or amount.

To apply or use force, effort, or influence.

A state of confusion or a medical condition with specific symptoms.