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Andrew Hunter
Works at Google
Attended University of Washington
Lives in Seattle, WA
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Andrew Hunter

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Do I know anyone who makes their own seltzer/soda water?

At work I really like citrus-flavored seltzer, and I'm unsure how to make it myself.  Citrus oils?  Acid?
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Seth Glickman's profile photoAndrew Hunter's profile photoRoss Bagley's profile photo
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Yeah, I have the kegs for carbonating other things (worked fairly well on flavored sugar water to make homemade soda for a birthday party). I've seen the 2 liter carbonating cap but never played with it. Looks like a cheap addition to the CO2 toolbox...
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Andrew Hunter

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I have a set of n points in the unit hypercube in D dimensions. Preprocess however you like; then make the following function as fast as possible: given an arbitrary subhypercube, draw an point from that subcube uniformly at random.

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Not presupposing any distribution on the points. They can be arbitrarily bad (and the query area might contain all or just one.)
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This is what happens when you make a tunnel for trains: it opens ahead of schedule, under the budget, and fucking works.

After all, it is well known that the ghost of Chief Si'ahl, being a big transit fan, routinely curses any public works intended for the use of individual cars.  Why King County didn't consider this before Bertha I'll never know.

For serious, I'm very happy that we'll have a saner rail system (given decades), but this is pointless duckspeak.
This is what happens when you make a tunnel for trains: it opens ahead of schedule, under the budget, and fucking works. No form of transportation is more irrational, more costly, and more stupid than the car. It is the deadest end.
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+Andrew Hunter Well, that explains the need for liquid Nitrogen.
Tasty as they look (and sound)?
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Bertrand Russell saw the history of civilization as being shaped by an unfortunate oscillation between two opposing evils: tyranny and anarchy, each of which contain the seed of the other. The best course for steering clear of either one, Russell maintained, is liberalism.
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http://priceonomics.com/the-increasing-scarcity-of-helium/

This is scary and not talked about at all.  By the way, a common reaction among tech-friendly types is "let's work harder on fusion power--that produces helium!"  It does, but in tiny quantities; mc^2 produces very large bangs from very small changes in mass.  To produce the amount of helium we use every year in the US alone, assuming 100% yield from a p-p cycle, we'd need to generate, in raw power, about 700 times the total power generated in the country right now.  Eeek.
It might make you sound like Donald Duck, but helium has a lot of serious technical applications. If it ever runs out, it's bad news -- and not just for balloons.
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Yeah I see an article to this effect every few years. If it actually mattered, the people who stood to lose out would be doing something. It's not unknown.
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With time running out to place the Mission market-rate housing moratorium on the November ballot, a decision is expected early as Monday by community members whether to do so — »
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Campos already tried to get this passed via the board of supervisors and failed, funny how now he's always supported getting this on the ballot via signatures. 
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Andrew Hunter

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My first attempt at bottled, carbonated cocktails. This is version 0 of what I'm calling the Bud Light Lime.

(Current iteration: per bottle, 2oz Vida mezcal, dash Regan's orange bitters, dash saline, 1/2 oz home made lime cordial (of annoyingly indeterminate strength), 1/4 oz simple.)
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+Avani Gadani Come have one and critique it! I bet it could use some work.
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LN2-muddled basil gimlet.  Oh yeah.
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I just watched, and really liked, Whiplash.  That said, given that MINOR SPOILERS AHEAD I sat through a literal ten minute drum solo at the end (for serious!) I think I am cheated by it not fulfilling this rule: http://www.theonion.com/blogpost/i-only-like-movies-where-the-whole-cast-dances-in--38502 C'mon, that'd be totally appropriate.

Also: (MAJOR-ISH SPOILER): I would be much, much less terrified by an angry director throwing things or even hitting me in rehearsal than ending up in front of a large audience playing a song I didn't know without sheet music.
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You know, Amazon, I don't think it was.
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Maybe they sent it via that ACME Dehydrated service that Wile E. Coyote uses.

...watch out for sudden storm clouds...
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I was a bit bored today and thought I'd try to make Coca-Cola flavored simple syrup.  The smart way to do this would be to, I don't know, buy fountain syrup.  I decided to boil off the water under vacuum.

I heated a small sample of Coke to about 75 C in the microwave; my thought was that this sort of gentle heat wouldn't alter the taste/cook sugar/etc, but would be the boiling point in my chamber vac (which reaches about .1 to .15 atm; so boiling somewhere in the 40-55 range.)  Put it in the chamber and set the vacuum.  It started to bubble heavily (probably the remaining CO2 disappearing) and the chamber fogged up heavily, but quickly all the activity stopped. Leaving it under the vacuum for a minute, nothing happened, and we saw next to no reduction.  

Testing temperature again, it was about 30C.  I think the issue is that I forgot evaporative cooling.  Specific heat of vaporization depends on temperature and pressure, but at the normal boiling point water's is ~2.23 kJ/g, and I don't think it changes by much under normal lab conditions.  Meanwhile the specific heat capacity of water is about 4.184 J/(g*K).  We see immediately that each percent of a sample of water that vaporizes is enough to cool it (assuming no heat input from the outside) by ~5 degrees.  So before I saw any significant boil-off, the sample would rapidly cool below the boiling point.  Drat.

This technique might be recoverable; I could use my Anova to produce a water bath and draw a vacuum over a (large!) flask; basically we're looking at a rotovap without the distillation apparatus. My chamber vac even has an attachment to pull from a container, but probably not the right hookup for standard lab equipment.  Well, you can't win them all.

#mineileavetochanceandchemistry
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Who wants to sell it? ;)
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Work
Occupation
Engineer
Employment
  • Google
    2009 - present
  • Aerospace
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Seattle, WA
Previously
San Francisco, CA - Florence, MA - Claremont, CA - Bristol, England - San Francisco, CA - Mountain View, CA - Florence, MA
Story
Tagline
It seemed like a good idea at the time.
Introduction
wannabe mathematician, reluctant software engineer, enthusiastic hunter-gatherer, young enough to know worse.
Education
  • University of Washington
    2009 - 2011
  • Harvey Mudd College
    2005 - 2009
Basic Information
Gender
Male
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Slowest Chipotle I have ever seen.
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Great selection of meats, like twenty choices for sides. Friendly service. Four sauces, all good, all different. Sides of excellent quality (if perhaps overpriced.)
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