34San Francisco, United States
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My self-summary
Update: After a year of very satisfying monogamy with my wonderful girlfriend / life partner, we've decided we could both use some adventure, so we're opening up our relationship. That means I'm available for both physical and emotional connections with women comfortable with non-monogamy, though be aware that she's a very special girl and will always be my #1.

Later update: I currently have two FWB in addition to my primary, so I'm getting close to a full dance card. But if we have a high match percentage or you just seem really awesome, I could still be interested!
What I’m doing with my life
I'm a biologist by training but over the Iast few years have gotten interested in AI. I worked at Google for a while but recently joined OpenAI. I've been thinking a lot about how to make AI technologies safe and likely to benefit everyone. Some of my recent work is described here:

My goal in life is to make the world a better place. If all goes well I'm planning to start a company based on my research, make a lot of money by providing useful services to people, and then give away most of that money to well-selected charities.

Along the way, I want to enjoy everything the Bay Area has to offer -- great food, a beautiful landscape, and a wonderful community of intelligent, caring people. I live in a community house with seven other people, and am loving it. All of us are into science, technology, and effective altruism, and our house feels like a cross between a tech startup incubator and a close-knit family.
I’m really good at
Anything technical or scientific. My job is in physics and computational biology, but I'm also interested in neuroscience, AI, economics, mechanical engineering, and many other things. I've managed (with some difficulty) to focus myself on just one career, but I tend to work on lots of side projects to keep myself happy and interested. I recently helped design a clock that is supposed to last for ten thousand years.

Endurance sports and outdoor activities, particularly swimming, cycling and running. I've been doing the three separately, but now that I have more free time, I'm starting to train for a triathlon. There are lots of great cyclng, running, and walking paths around the Bay Area, and I'm hoping to explore as many as possible in the next couple years.

Juggling! Or at least I'm getting there. One of my researcher friends is also a professional circus clown, and he's teaching me to do juggling tricks.

Also, I'm told I am an excellent cuddler.
The first things people usually notice about me
Hard to say -- the chainsaw, the facial deformities, and the maniacal laugh all tend to draw attention, so it's a toss-up which you'll notice first. Meet me in person and you can find out!
Favorite books, movies, shows, music, and food
TV: The Simpsons, Babylon 5, Star Trek: The Next Generation, Firefly, Nana, Battlestar Galactica, Death Note

Food: I very much like most kinds of Asian food -- Thai, Vietnamese, Chinese, Japanese, Indian, etc. Also Italian. Frankly, in the Bay Area, it doesn't much matter, since almost everything is good.

Books (fiction): Like most nerdy or semi-nerdy types I'm very into science fiction, though I also like various other things. A few of my favorites: Ender's Game, Speaker for the Dead, Lord of the Rings, The Diamond Age, True Names, Rosencrantz and Gildenstern are Dead, Arcadia, An Enemy of the People, the Illuminatus Trilogy, the Galactic Milieu Trilogy, The Left Hand of Darkness, The Player of Games, Consider Phlebas, Brave New World, Odd John

Books (nonfiction): Guns, Germs, and Steel, The Bottom Billion, On Intelligence, How the Mind Works, The Life You Can Save, A Farewell to Alms

Music: I like a lot of 90's bands, but also some more recent stuff. My favorite band is Third Eye Blind. Others include: Barenaked Ladies, They Might be Giants, Death Cab for Cutie, Red Hot Chili Peppers, The Postal Service, Angels and Airwaves, Green Day, Belle and Sebastian

Movies: Rashomon, Eternal Sunshine of the Spotless Mind, Lord of the Rings, Memento, Run Lola Run, Ninja Scroll

There should be a section for board games! Some of my favorites are Dominion, Innovation, Battlestar Galactica (actually kind of broken as a game, but too much flavor not to enjoy), 7 Wonders.
Six things I could never do without
Leaving aside the many absurd replies I've seen here (e.g. the kind of things that you would literally keel over and die if you didn't have), I'd say the few things I'd be most sad to do without are:

1. Intellectual challenge. I am really intense about solving hard problems, and easily get bored if I'm not doing something interesting enough.
2. My sister. She's my best friend, and the person I always turn to when I'm lost or in doubt.
3. San Francisco.
4. My friends.
5. Books. Though nowadays I suppose I should say "Amazon Kindle".
6. Some form of physical exercise.
I spend a lot of time thinking about
Why biology is so complicated. Whether embryo selection will raise the average IQ of future generations. Why my MacBook has such poor battery life (a particularly pertinent question as I scramble to finish this profile). Whether I will ever achieve my dream of owning a monkey (the Endangered Species Act makes this not entirely straightforward). How to make life better for people in the developing world. When, if ever, we will colonize Mars.
On a typical Friday night I am
The same thing we do every night, Pinky...
The most private thing I’m willing to admit
I'm a chain-smoking kleptomaniac. Also, I am either an arsonist or a cannibal, but you'll have to ask me in person to find out which one.
You should message me if
You got some of the rather obscure references above (though this isn't a requirement).

You are new to San Francisco and want someone to explore the city with. I grew up here and greatly enjoy showing others the beauty of my native city.

You want to save the world. Or, more generally, you have something that you passionately believe in. It helps to be smart, hot, and kind-hearted, of course, but what I really look for is that rare special spark possessed by people who have a worthwhile dream and who live with a purpose.
The two of us