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.
Answer Wiki. In truth, 1945, if we interpret the Cold War as when the US and USSR started their competition in the postwar world. It could be argued that the postwar global arrangement was pretty much set up at the Potsdam Conference. Another potential starting point was the Iron Curtain speech by Winston Churchill on March 5, 1946.