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.
Many observers have suggested that the start of the cold war occurred with the death of US President Franklin D. Roosevelt in April 1945. His successor, Harry S. Truman immediately rounded on the Soviets and informed Josef Stalin that he would take a much harder line with them.