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The dilemma of population ethics

What's population ethics?A while back I read through this excellent introduction to population ethics:http://plato.stanford.edu/entries/repugnant-conclusion/Popluation Ethics is about how to make...

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Making graphene

This article piqued my interest, since it suggests that making graphene can be made cheaply and easily:http://hackaday.com/2012/03/20/print-your-own-supercaps/That article includes links to the March...

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Light bulb aisle

Big box stores are different in Phoenix.  Here is a typical bike helmet:But most fascinating was their light bulb aisle, which extended across the entire length of the western wall of the store.  It...

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Shop Essentials

A friend of mine is building a treehouse for his kids, and it got me thinking about how I'd outfit an empty garage for that kind of work.These are the basic ingredients I had in my shop around the time...

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Wavy shelf

wavy-shelf.skp  Next the Son, the Stunning-Cantab:He suggested curves of beauty,Curves pervading all his figure,Which the eye might follow onward,Till they centered in the breast-pin,Centered in the...

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Sketchup 2013 with wine in linux

Tried to install Sketchup 2013 on Ubuntu Lucid, and it kept complaining about needing to install the Windows Imaging Component. Downloaded it:...

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Flour smells like soap

Recently a batch of bread I made had an aftertaste like soap.  Then the next day my wife made pizza dough from the same flour and yeast, and it had the same effect.Searching online, I read about lactic...

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Water heater burner only runs for a second

If you're lighting a water heater and the pilot lights fine, but when the burner engages, you only get a brief puff of gas, check the gas shutoff valve for the house.  Sometimes they leak, so that gas...

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Sagulator

This is a really handy tool to figure out how much deflection to plan for when building wood structures:http://www.woodbin.com/calcs/sagulator.htmPlywood seems to do about as well as solid wood, and...

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Read text format protobuf from file in Java

    java.io.InputStream inputStream = [open file and get input stream]    java.io.InputStreamReader reader = new java.io.InputStreamReader(inputStream);    MyProto.Builder myProtoBuilder =...

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Raspberry Pi GPIO pins to stepper controller

I picked up a 3-axis beefy NEMA-23 stepper kit from ebay that sell for around $240.  It comes with a Longs Motor DM542A stepper controller, which seems to be more or less identical to a lot of other...

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Chrome only supports one concurrent download per URL

Well this took me several hours to figure out: chrome will only let you have one download in progress from the same URL at the same time.  The second attempt will just hang until the first one is...

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Richard Hamming: "You and Your Research"

This talk is worth re-reading every few years.  I've copied the text in case the original site goes down.http://www.cs.virginia.edu/~robins/YouAndYourResearch.htmlRichard Hamming``You and Your...

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Optimal Psychology

Here's an idea out of left field. I get the sense that most psych research is looking for economy at scale (easy things that make a small difference in entire populations) or narrow results (eg.,...

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On Hydrogen Bombs

From "Turing's Cathedral", regarding the H-bomb:According to Oppenheimer, at a briefing given by Edward Teller and the RAND Corporation, Secretary of the Air Force Thomas K. Finletter "got to his feet...

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Death, the destroyer of worlds

Lots of people know Oppenheimer's quote about being present at the Trinity test, the first man-made nuclear explosion: "We knew the world would not be the same. Few people laughed, few people cried,...

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Using xrandr instead of nvidia-settings

On my Linux Ubuntu 12.04 machine, the nvidia-settings app has been crashing, preventing me from changing screen resolution or refresh rate (I like to switch to 24fps for watching movies so that slow...

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Saving a variable number of matches from a Perl regex

Intuitively it seems like the regex /(.)+/ should return an array of all the characters in a string.  It's a match group with a quantifier allowing it to repeat, after all.  But in fact it only returns...

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fopen() read/write/create/append brokenness

It's amazing how long fopen() has managed to be around while still having confusing behavior.The big culprit in my mind is the "a+" mode, which really ought to do the thing I want, which is to open the...

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Nexus 4 USB tethering to Raspberry Pi is broken

I tried to get my raspi online by plugging it into my Nexus 4 via USB, then enabling USB tethering under Android's wireless settings dialog.  The 'usb0' interface appeared briefly with ifconfig, but...

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