Multiple births are a great addition to research addressing genetic and environmental influences on behavior. It occurred to me that the new octuplets offer some amazing possibilities: The eight babies include:

28 twin pairs

56 triplet sets

70 quadruplet sets

56 quintuplet sets

29 sextuplet sets

8 septuplet sets

They also offer an amazing array of identical and fraternal pairs, as well as same-sex and opposite-sex sets.