Let us assume that our 1900 and 1990 12-year-olds are identical twins magically born 90 years apart.
There are 12 year old twins who are identical but not born in the same year.
mnli hypothesis: There are 12 year old twins who are identical but not born in the same year. premise: Let us assume that our 1900 and 1990 12-year-olds are identical twins magically born 90 years apart.