One of my favourite brainteasers are the cipher riddles by Michael Pousen. This link takes you
 to his homepage where a new version of this riddle is created whenever you reload that page. 
The solution and help is also provided there for each individual riddle.

Each symbol represents a cipher.
A number consists of groups of two to four ciphers.
Which symbol represents what cipher so that no equation leaves remainders?

Modern scientific theories

One thing I am interested in is modern theoretical physics, especially theories about the nature of our universe. 
I will try to explain in short some fascinating aspects of these under the following links:

COMING SOON:

String theory - We live in an 11-dimensional world

Black holes - what are these?

Possibility of parallel universes

Possibility of life on planets in interstellar space

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