This nest building behavior is instinctual for male bettas and it is not necessary to have a female present to observe your betta building his nest. Most males will blow bubbles but the rate and size of the nest seems to depend on the individual male and possibly, other factors like age, health and water parameters.
Berlin was always the centerpiece of the Cold War and, more often than many remember, very nearly the front line of real combat. At the end of World War II, the city was divided into four sectors, each occupied by one of the four allied armiesâU.S., Soviet, British, and French.
The cold war, an ideological conflict between Communist and non-Communist countries, started after World War II (1939-45) when the Allies (United States, Britain, France, and the Soviet Union) disagreed over how to govern occupied Germany.he cold war started in 1945 after the World War II. The cold war  was between Russia and some of the western countries. The existence  of the nuclear weapons is what led to â¦ the development of the Cold  war.