AI
One of the few areas in science where there are many unresolved problems to be researched is artificial intelligence.

Where as many main stream problems in physics, biology etc. are fairly well solved, there are quite some basic problems in artificial intelligence which are matter of current research.

AI deals with the modelling of systems which acts intelligently in a certain environment. And here is the first question: What is intelligence actually?
There are 4 different views of intelligence:

  • Act like a human beeing.
  • Think like a human beeing.
  • Think rational.
  • Act rational.
The first view is the most difficult way to implement and the last one is the easiest.

Artificial intelligence is a field which overlaps with many other sciences like psychology, philosophy and biology.