Hello.
Preface is that according to modern psychology humans have two positive base emotions: joy and interest/curiosity (named happiness and surprise in scientific literature).
To lead a healthy life one must feel these two often enough lest other five base emotions (fear, anger, disgust, sadness, contempt) take over and person becomes unhappy.
As an adult one has duties to fulfill, be it job, marriage, parenthood. One has limited time after these duties and it is usually used for recreational activities and to study/do things we find enjoyable.
What are those things you do daily that fit such criteria of giving you mostly joy and intellectual satisfaction/feeding your curiosity?
Ps.
I know there are younger people on forum as well and you are welcome to chime in with things you do after school.
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For me right now it's an exploration of Creativity. Also anthropology as such. How do people live in different parts of the world?
Understanding the limits of the human body. Are people who are ambidextrous also more intelligent than right-handed and left-handed people?
How does the perception of the world change if a right-handed person learns to write with his left hand for months?
Does it give something, change a person's character and way of thinking?
Are there gestures that all humans understand because they are passed down from generation to generation, as animals have genetic memory?
How does handwriting reflect a person's character? How does people's thinking change when they learn to write Arabic from right to left?
What does a Renaissance man mean in the 21st century? A Leonardo Da Vinci type person who knows anatomy, medicine, engineering, and painting?
Where are such people to be found, are they in laboratories and in scientific institutes? If there is no correlation between high IQ and ethics and morality, then why do people with photographic memory and fast navigation in large amounts of data still end up in prison? What is their motivation?
Things I do daily that give me intellectual satisfaction and feed my creativity, and give joy...
Well, the joy part is easy. Maddy gives me joy. She's 16 1/2 years old, and every day that she's still alive is a relief. There are times when I watch her breathe, relieved that she's still as okay as an elderly cat can be. She took a sudden downturn shortly after her birthday last year during a heat wave - wasn't eating or drinking enough, and that's usually a very bad sign in an elderly cat. I got her through it, though. I took the food and water to her, and hand fed her and either held the water bowl up to her for easier access or poured water in my hand for her to lap up. She made it through.
The rest... I never stopped wanting to learn new things. I can't fathom people who abandon their sense of curiosity. It was really sad one day at the main bus stop downtown a few decades ago. I'd just come from the bookstore, having bought
Dicing With Dragons, by one of the creators of the Fighting Fantasy game (I currently co-admin a FB group dedicated to that game). I couldn't wait to start reading it, the buses wouldn't be along for another 10-15 minutes, so I opened the book and started to read.
A young girl of about 12 saw the dragon on the front cover and said in a scornful voice, "There's no such thing as dragons!".
I told her, "There are, in our imaginations."
She said, "No there aren't" and went off elsewhere to wait. I found that very sad that a 12-year-old had given up on imagination. But then at her age I'd discovered Star Trek, my interest in astronomy and other sciences had been rekindled, and so I started reading voraciously on a much wider array of topics than ever before.
I've read a lot more of Asimov's essays than his fiction; his essay collections were my free-reading go-to and my bedtime reading. My classmates couldn't wrap their heads around it - me reading science essays and astronomy books when I didn't have to. They'd ask, "What class is that for?" and when I said none, I was reading it for fun, they shook their heads and clearly thought I was nuts. Why would anyone read nonfiction for fun? They couldn't fathom it. They'd probably have had the same reaction years later when I started reading Roman history for fun.
So how I'm currently dealing with this is all tied up with writing. That first NaNoWriMo win in 2016 was a novelization of one of the Fighting Fantasy gamebooks, and after pulling that off in November plus the two subsequent Camp NaNoWriMo events the following April and July, I decided that a hat trick like that proved my win wasn't a fluke - I did it once, so I could do it again. I had to sit November 2017 out because the computer decided to break down at the worst possible time; it spent part of November in the repair shop and there's no way I could have caught up. So November 2017 was a bust. But from 2018 on, it's been a winning streak no matter if the Camp events or the main events in November. I've found my writing niche (to my surprise it's
not science fiction, but rather historical fantasy, whether novelizing a game or based on a favorite TV show or movie), and would need another lifetime to write
all the ideas that have come along. I've accomplished what NaNo originator Chris Baty hoped people would do: Writing is part of my daily life in a way that eating and drinking and feeding that cat are. I write every day, in addition to posting here, on a couple of other forums, and on FB and YT.
Writing anything history-related, for me, means research. Even if it's historical fantasy. I won't claim I found joy in researching medieval torture methods for my own story or when I helped a friend with his Highlander story by researching execution methods used in the late Roman Republic. Both of us needed to know these things to make our stories more authentic, because for one thing it's a matter of pride and satisfaction to know what we're talking about, and for two things, our targeted readers would also be familiar with these details. Nobody wants feedback that says, "You screwed up."
(Just yesterday I was thanked by a Merlin fanfic author for diplomatically pointing out that if Lancelot married Queen Mithian, his title wouldn't be "Queen-Consort"; I explained what his title should be, depending on a couple of factors, and she said she'd make the change - an easy fix because it's only a few changes in 3 chapters. Why point this out? It was taking me out of the story.)
I'm learning lots of other things in my research as well. I planned to have a storyline in which a bunch of immortal/Immortal characters, for various reasons, end up on the same trans-Atlantic cruise. Oops, I know nothing about cruise ships. Well, there's no shortage of YouTube videos on the subject, from the pov of both passengers, reviewers, and crew. In fact, I'm so tempted to include a couple of the reviewers in the story as a kind of cameo (they're quite entertaining), but then this story couldn't be posted on fanfiction.net due to the rules against including real people who aren't historical figures.
This is all what counteracts the anger and depression over the political situation in my province. I take no joy in that these days. None whatsoever.
DMing Dungeons and Dragons count?
DMing requires being organized, having an imagination, and a good sense of storytelling, regardless if you're running an already-published commercial campaign or making up your own. It requires being able to think on your feet while sitting down, because there's not a D&D player anywhere who didn't find a loophole in the rules (or who doesn't at least try) and attempted to convince you that their actions will work without violating the rules, and the consequences will make cow pies of your intended campaign - do you allow their action, not allow it, or allow it in a limited way? Whether their argument involves a loophole or just some unorthodox strategy that you or the campaign creator didn't anticipate, that's something that needs to be decided quickly.
There can be immense satisfaction in resolving situations like these, no matter which side of the screen you're on. One of the strategies I used as a player was fully legal, I 'borrowed' it from a novel by Joel Rosenberg, and one of my fellow players gasped, and asked, "What alignment
are you?!

" I don't recall what my stated alignment was for that campaign - part of it was Neutral, and my character was a magic-user. But the action (while aggressive in a way I would never do in RL) was intended to help get our group out of a tight spot, was not premeditated murder, so the DM allowed it.
Anything that objectively prolongs your lifespan does.
I assume you mean that experiencing the positive emotions you listed objectively prolong your lifespan?
I would include "love" in that list, btw. I do not gain joy or happiness when my cat does something destructive, but I still love her.