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..
diÂ·zyÂ·gotÂ·ic twins. twins derived from two zygotes. Synonym(s): dichorial twins, diovular twins, fraternal twins, heterologous twins. dizygotic twins. two offspring born of the same pregnancy and developed from two ova that were released from the ovary simultaneously and fertilized at the same time. They may be of the same or opposite sex, differ both physically and genetically, and have two separate and distinct placentas and membranes, both amnion and chorion.