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.
It also gave a strongly defiant message to the Soviet Union and effectively put paid to Moscow's hopes of driving the Allies out of West Berlin. Two months later, President Kennedy negotiated the first nuclear test ban treaty with the Soviet Union, in what was seen as a first step towards ending the Cold War. But on 22 November that year, he was assassinated, shot in the head as he drove through Dallas, Texas, on his way to a political festival.