Beyond the Book
Conjoined twins
occur in about
40,000 births
but only about
once in every
200,000 live
births. Craniopagus-twins
occur in only
about one in
every 10 million
live births. Did you know?
Medical advances have led to the discovery of another type of twin, known as tetragametic chimeras, where the embryos of two non-identical...












