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.
âDuring the Cold War it was the scene of exchanges of spies.â âWho started the Cold War - the United States or the Soviet Union?â âThere is also the thing, which I think explains a lot of this, is a Cold War mentality.â âDuring this Cold War, United States military aircraft flew thousands of covert reconnaissance intelligence flights.â