Just in case you weren't aware, there is a White House petition to pardon Snowden that is almost at the 100K signature threshold:
https://petitions.whitehouse.gov/petition/pardon-edward-snowden/Dp03vGYD
Check out the official rover press kit for a summary of the computer design (http://mars.jpl.nasa.gov/msl/news/pdfs/MSLLanding.pdf) Page 42 in particular:
"Curiosity has redundant main computers, or rover compute elements. Of this “A” and “B” pair, it uses one at a time, with the spare held in cold backup. Thus, at a
given time, the rover is operating from either its “A” side or its “B” side. Most rover devices can be controlled by either side; a few components, such as the navigation camera, have side-specific redundancy themselves. The computer inside the rover — whichever side is active — also serves as the main computer for the rest of the Mars Science Laboratory spacecraft during the flight from Earth and arrival at Mars. In case the active computer resets for any reason during the critical minutes of entry, descent and landing, a software feature called “second chance” has been designed to enable the other side to promptly take control, and in most cases, finish the landing with a bare-bones version of entry, descent and landing instructions.
Each rover compute element contains a radiation-hardened central processor with PowerPC 750 architecture: a BAE RAD 750. This processor operates at up to 200 megahertz speed, compared with 20 megahertz speed of the single RAD6000 central processor in each of the Mars rovers Spirit and Opportunity. Each of Curiosity’s redundant computers has 2 gigabytes of flash memory (about eight times as much as Spirit or Opportunity), 256 megabytes of dynamic random access memory and 256 kilobytes of electrically erasable programmable read-only memory.
The Mars Science Laboratory flight software monitors the status and health of the spacecraft during all phases of the mission, checks for the presence of commands to execute, performs communication functions and controls spacecraft activities. The spacecraft was launched with software adequate to serve for the landing and for operations on the surface of Mars, as well as during the flight from Earth to Mars. The months after launch were used, as planned, to develop and test improved flight software versions. One upgraded version was sent to the spacecraft in May 2012 and installed onto its computers in May and June. This version includes improvements for entry, descent and landing. Another was sent to the spacecraft in June and will be installed on the rover’s computers a few days after landing, with improvements for driving the rover and using its robotic arm."
And according to a release they issued after landing, both computers receive the same updates and are running the same software (not a version or 2 behind like others have suggested): http://mars.jpl.nasa.gov/news/whatsnew/index.cfm?FuseAction=ShowNews&NewsID=1305
Wikipedia has a good writeup: http://en.wikipedia.org/wiki/Tupolev_Tu-4
Way back when, at that age, I first got interested in programming via the game Robot Odyssey (http://en.wikipedia.org/wiki/Robot_Odyssey)
According to the Wikipedia page there are modern day clones and derivatives:
"The engine for the game was written by Warren Robinett, and variants of it were used in many of The Learning Company's graphical adventure games of the time, including Rocky's Boots, Gertrude's Secrets, Gertrude's Puzzles, and Think Quick!, all of which are similar but easier logic puzzle games. The gameplay and visual design were derived from Robinett's influential Atari 2600 video game, Adventure.
Carnage Heart involves programming mechas that then fight without any user input.
Cognitoy's MindRover is a relatively recent game which is similar in spirit to Robot Odyssey, but uses different programming concepts in its gameplay.
ChipWits by Doug Sharp and Mike Johnston, a game for the Apple II, Macintosh, and Commodore 64 computers is similar in both theme and implementation, although the interface to program your robot differed.
Epsitec Games created Colobot and Ceebot in recent years for Windows machines which are in many ways spiritual successors to Robot Odyssey. In these games the player program machines to accomplish puzzle tasks. Instead of using logic flops, switches, etc., these two games instead teach the player the fundamentals of object oriented programming like Java, C++, or C#.
One Girl One Laptop productions created a spiritual successor called Gate which uses the same digital logic puzzles as Robot Odyssey.
There is also a clone written in Java, Droidquest, which contains all of the original levels and an additional secret level."
Linus:
In light of the recent anniversary of Slashdot, are you willing to go ahead and claim the Slashdot UID that was reserved for you since day one? (I believe UID#2)
According to the original mashable article (http://mashable.com/2012/10/02/twitter-entertainment-weekly-ad/) The 1000 copies were only distributed in New York and Los Angeles.
It all has to do with shifting the center of mass. From the official NASA press kit: http://mars.jpl.nasa.gov/msl/news/pdfs/MSLLanding.pdf
After the turn to entry, the back shell jettisons two solid tungsten weights, called the “cruise balance mass devices.”
Ejecting these devices, which weigh about 165 pounds (75 kilograms) each, shifts the center of mass of
the spacecraft. During the cruise and approach phases, the center of mass is on the axis of the spacecraft’s
stabilizing spin. Offsetting the center of mass for the period during which the spacecraft experiences dynamic
pressure from interaction with the atmosphere gives the Mars Science Laboratory the ability to generate lift,
essentially allowing it to fly through the atmosphere. The ability to generate lift during entry increases this mission’s
capability to land a heavier robot, compared to previous Mars surface missions.
The spacecraft also manipulates that lift, using a technique called “guided entry,” to steer out unpredictable
variations in the density of the Mars atmosphere, improving the precision of landing on target.
During guided entry, small thrusters on the back shell can adjust the angle and direction of lift, enabling the
spacecraft to control how far downrange it is flying. The spacecraft also performs “S” turns, called bank reversals,
to control how far to the left or right of the target it is flying. These maneuvers allow the spacecraft to
correct position errors that may be caused by atmosphere effects, such as wind, or by spacecraft modeling
errors. These guided entry maneuvers are performed autonomously, controlled by the spacecraft’s computer
in response to information that a gyroscope-containing inertial measurement unit provides about deceleration
and direction, indirect indicators of atmospheric density and winds.
After the spacecraft finishes its guided entry maneuvers, a few seconds before the parachute is deployed, the
back shell jettisons another set of tungsten weights to shift the center of mass back to the axis of symmetry.
This set of six weights, the “entry balance mass devices,” each has a mass of about 55 pounds
(25 kilograms). Shedding them re-balances the spacecraft for the parachute portion of the descent.
It's a naive, domestic operating system without any breeding, but I think you'll be amused by its presumption.
