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Articles by Adam Matan
Why does ST_Distance_Sphere uses WGS 80?
It doesn't use WGS80. You are looking at old documentation for version 1.4. In more up to date documentation it states WGS84 is assumed. See here where it states: This function currently does not look at the SRID of a geometry and will always assume its in WGS 84 long lat. The version you quote from (1.4) also only implemented ST_Distance_Sphere for points (being prior to 1.5). The documentation since 1.4 all states that WGS84 is used.
Why isn't Oracle Java included in the standard Ubuntu repo?
Ubuntu has OpenJDK in its repository. It's the open-sourced version of the Oracle JDK. It is a myth that OpenJDK is lower and less stable, but this was the past. Today (since version 7), they're pretty equal. OpenJDK is even the reference implementation for Java 7. It's a race between those two implementations, as some new features appear first in OpenJDK and then later get included to OracleJDK, while some features get included the other way round.
Change default shell from bash to zsh
Surprisingly this doesn't work with the command line tools as one would expect. This needs to be done with the System Preferences app. The following steps work with multiple versions of Mac OS X through at least 10.10 (Yosemite). Open up the "User's & Groups" panel in the "System Preferences" app. Make sure the panel is unlocked (bottom left) Control click on your username (top left) and select "Advanced Options..." This is only available if you are an Administrator. 4.
Colluding miners attack: Is the Bitcoin protocol compromised?
A very interesting academic paper has been recently published by two researches from the Cornell University (abstract, full PDF): The Bitcoin cryptocurrency records its transactions in a public log called the blockchain. Its security rests critically on the distributed protocol that maintains the blockchain, run by participants called miners.
How to deactivate iPhone USB tethering when OSX is connected to a wireless network
I have enabled USB tethering from my iPhone to my MacBook pro, and it works perfectly. Nevertheless, I would like to automatically disable USB tethering when the MacBook Pro is connected to a wireless network, to save mobile data consumption. How can I configure that in OSX?
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