Simulation

http://www.microsoft.com/games/flightsimulatorX/

Flight simulator is one of the most famous retail simulators nowadays. As the name suggest it is an airplane sumulator, that is widely used worldwide, not only for domestic use, but it is also used by many pilots. Conditions in game are very real. With over 20 000 airport the player can fly from one end of the world to the other.

This is a real advance in simulator, it offers professional simulation to everyone.

Tutorials

Tutorials

Tutorials are step to step guides with detailed info about a certain thing.
Now a days on line you can find millions of tutorials about lots of things.
There are tutorials for electronics, fishing, making your own bombs, playing games, etc.

For example the following page "instructables" there are tutorials from things such as how to make your own USB storage device using an old hard drive to how to milk almonds.

There are tutorials on almost any subject for that matter. It is only a matter of doing some interwebs search in order to find out what you need.

(AI)Artificiall intelligence, what is it?

What is AI?
Basically "this" article which is formatted to a Question-Response style, describes the basic concepts about artificial intelligence. It is very interesting to note that there are various types of intelligence, and that artificial intelligence is not always trying to imitate human intelligence.

Cryptography

cryptography is the practice and study of hiding information. Modern cryptography matches the area of mathematics, computer science, and engineering.
For example:
the use of cryptogrphy could encrypting passwords, so as to prevent theft of your personal passwords.
Encryption in commercial transactions as a way to prevent hackers from stealing credit card and banking account information.

http://www.wisegeek.com/what-is-encryption.htm