Eski Kermen is the medieval city-stronghold in the Crimea. This name means "an old fortress" in the Tatar language. Eski Kermen was founded in the VIth century as a Byzantine stronghold and had existed till the end of the XIVth century. As it was not so big and important those times no significant events or historical facts remained. But
from the Xth century the town and naturally its importance began to grow. The prosperity of Eski Kermen is related to the XII-XIIIth centuries, when the town popularity was more than 3,000 people. In 1299 the stronghold was destroyed and ravaged by Mongols. Since that time it hasn't restored its significance.
Since early childhood everyone knows that substance can exist in three states: solid, liquid and gas. A perfect example of it is ordinary water. We can observe it in all the three states in our daily life (especially in a kitchen). However, there exists another state
which is called plasma... The Novosibirsk Institute of Nuclear Physics is one of the world's leaders in studying plasma. They have some very interesting setups, so-called "plasma traps". Let's see how they work and what they are needed for.