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..
Dizygotic twins. Home Â» Dizygotic twins. Definition. noun. Two offspring that develop from two zygotes but share a common uterine environment, and would be born at the same birth. Supplement. Twins refer to the two offspring that are brought forth by the same pregnancy and birth. Twins may be monozygotic (or identical) or dizygotic (fraternal). Dizygotic twins are twins that develop from two zygotes. Dizygotic twins are non-identical because they arise from two eggs, each fertilized by a sperm. They are siblings who have shared a common uterine environment. They are due to fertilization of two different ova by different sperm.