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.
Overnight, the freedom to pass between the two sections of Berlin ended. Running across cemeteries and along canals, zigzagging through the city streets, the Berlin Wall was a chilling symbol of the Iron Curtain that divided all of Europe between communism and democracy. Berlin was at the heart of the Cold War. In 1962, the Soviets and East Germans added a second barrier, about 100 yards behind the original wall, creating a tightly policed no man's land between the walls. After the wall went up, more than 260 people died attempting to flee to the West.