Knowledge: Advil is a medicine to make the body feel better within 30 minutes after taking it. On the other hand, pills for depression are available but it does not help much as human brains are complex to understand.

Conversation:
How can you explain people can change emotional behaviors all of a sudden?
I am not sure about the answer to that, but speaking of mood, I can tell you about Bipolar disorder, which causes people to have periods of depression as well as periods with the mood elevated. Have you ever heard of it?
I have little knowledge about it. What else do you know?
Its a disorder previously known as manic depression. It can cause periods of depression.
I did not know that. Depression a is a very serious consequence of bipolar disorder.
Yeah, individuals can even poorly think about some decisions and disregard the consequences.
That's very sad. Is there a medicine to make it better?

Response: Yes, there are medicines for depression but it does not help much as human brains are complex.