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 began in the aftermath of World War II. Although only recently allied against Germany, the United States and the Soviet Union saw their relationship quickly dis-integrate. The division of Europe, with the Soviet bloc countries sealed off behind what Churchill called the iron curtain, had been the first blow.