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.
The MODERN hamburger was invented by Charles A. Hamburger at the Saint Charles Hotel in Chicago back in 1937. The modern day hamburger started out as a square shape .. like those you see at White Castles. They slowly added the idea of rounding out the hamburger during the mid 1940's.