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.
Burger King's Whopper, invented in 1957, is a quarter-pound flame-broiled burger plus fixings. McDonald's Big Mac, invented in 1967, is two 1.1-ounce patties separated by a third bun, plus cheese, fixings, and a special sauce that tastes like mayonnaise plus ketchup. The Big Mac also uses dehydrated onions instead of fresh.