Ciliate conjugation is a sexual phenomenon that results in genetic recombination and nuclear reorganization within the cell. In most ciliate groups, however, the cells separate after conjugation, and both form new macronuclei from their micronuclei.
Before the bun, hamburgers are said to have been served between two pieces of bread. In fact, a ground beef patty was known as Hamburger steak (first mentioned in an American cookbook in 1891); when this was put between bread or in a bun it was called a Hamburger sandwich.
A common misconception is that the first hamburger was created in Hamburg, Germany. While the inspiration for the hamburger came from Hamburg, the sandwich concept was invented much later. During the 19th century, Hamburg became famous for their beef, from cows raised in the regional countryside.