The first reliable spark plug was invented in 1903 by Oliver Lodge. They're aptly named as well; spark plugs are simply insulated plugs that are screwed into an internal combustion engine's cylinder head to deliver the spark that ignites the mixture of air and fuel in the combustion chamber.
Are Irish Twins Technically Twins? Irish twins are not technically twins, meaning two people born from the same gestational period. It's a colloquial way to classify siblings that are born close together. Sometimes the use of the term Irish twins is expanded to describe any siblings that are close in age. Some even stretch the definition to include siblings less than two years apart. Some would call that almost Irish twins or practically Irish twins..
Irish dancing or Irish dance is a group of traditional dance forms originating in Ireland which can broadly be divided into social dances and performance dances. Irish social dancing can be divided further into cÃ©ilÃ­ and set dancing. Irish set dances are quadrilles, danced by four couples arranged in a square, while cÃ©ilÃ­ dances are danced by varied formations (cÃ©ilÃ­) of two to sixteen people.