An international mobile subscriber identity (IMSI)
is a unique number, usually fifteen digits, associated with Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS) network mobile phone users. An IMSI catcher is a device, used by the NSA drone program
, the police
, Chinese spammers
and spies all around Washington DC
and the world
to spoof the identity of a GSM cell tower and intercept cellular voice and data communication. They come in
all sizes and flavors, from tiny
professional surveillance devices, to easy to order off the shelf solutions
, to Chinese DIY
(links in Chinese) and have spawned efforts to retaliate with an IMSI-catcher-catcher
. IMSI-catcher technology has become increasingly widespread
, with far-reaching constitutional
Epic Conway's Game of Life.
Sure, there's been lots of Conway's Life stuff on MeFi previously [1 2 3
], but this squeezes a lot of awesome stuff into a short video.
In August 2011, 35 ACLU affiliates filed 381 requests in 32 states with local law enforcement agencies seeking to uncover when, why and how they are using cell phone location data to track Americans
. So how long do American cell phone carriers retain information about your calls, text messages, and data use? According to data gathered by the US Department of Justice, it can be as little as a few days or up to seven years, depending on your provider
. (Via / More)
A functional self-replicator has been designed for Conway's game of life.
The deceptively simple automata 'Conway's game of life' is a model system that illustrates how simple 'physics' can give rise to incredibly complex phenomena. Although a menagerie of existing patterns have been discovered/engineered that display a variety of interesting behavior (eg here
), there are also many unanswered questions
about what is possible within the simulation. Recently, life-enthusiast mscibing succeeded in designing a universal constructor pattern that is capable of building a functional copy of itself. Its execution can be viewed directly (though it takes a while!) using Golly
, a sweet, open-source app for viewing life simulations, as well as other cellular automata.
In Chinese, Shanzhai
(山寨) literally means "mountain stronghold
" and connotes a place with limited accessibility -- i.e. beyond the reach of authorities. In the past couple of years, it has come to refer to the manufacture of illicit tech gadgets
by unauthorized factories: show us your shan zhai ji
! But shanzhai
can be used more broadly to describe knockoff culture
, cheeky brand subversion
, grassroots industrial creativity
, and a certain DIY ethos. The latter may be best exemplified in these videos of a "Shanzhai Glider"
in action. Apologies if the Chinese sites are slow-loading or unreachable for Western audiences. Mouse over links for descriptions, if so inclined.
Composer Max Richter's
newest work, 24 Postcards in Full Colour
, is a series of ringtones.
Cell Phone Reception and Tower Search
: "...searchable databases of over 130,000 cell phone tower locations registered with the FCC, and over 43,000 cell phone carrier comments submitted voluntarily from real customers using their service all over the U.S. ...and with our graphical tower location search, users can pinpoint nearby tower locations. Even to the exact rooftop with satellite imagery and the help of Google Maps!"[e.g. Casper, Wyoming]
You can also search for dead spots
, and see how your neighbors really, truly feel about their reception.
goes live for demo
. Lots of video and stills. Cache.
Meat is Neat.
We are but tiny machines. Remember the YouTube video of a funky animation of cellular activity? Here it is with a voice explanation of what's going on. Absolutely mindblowing.
some sort of embedded video, dsl-quality with sound. see here for other forms
PSA: Want to get out of your Sprint - Nextel wireless contract without paying a penalty?
Thanks to the fine print in their contracts, Sprint must
give many that option— but only until Oct. 31st. (USAfilter)
You may have heard of Conway's Game of Life
, where pixels "live" or "die" based on a few simple rules about how many neighbors they have. But did you know that in the 30 years since the game was created, Life enthusiasts have (created? discovered?) an extensive catalog
of (objects? creatures?
) which interact to form some amazing
, sometimes beautiful
, occasionally even a little scary
patterns often starting from the simplest
of building blocks
? (Including a Turing machine
!) Or that a lone pixel
can exert remarkable control
over its environment? Now you can see in a few seconds in a java applet
, on your desktop
, or even on a PalmOS handheld
the outcome of simple patterns that, when first discovered, no computer could handle. A mind blowing example of the power of emergent properties
I should like to purchase this sexy phone,
but am I gonna get a brain tumor if I do?