1. The relative frequency of fraternal twins has halved since 1950.

2. Noelle and Craig are fraternal twins.

3. Illidan is the fraternal twin of Malfurion Stormrage and, like his brother, grew up as the friend of Tyrande Whisperwind millennia before the Great Sundering .

4. Malfurion is the fraternal twin of Illidan Stormrage and, like his brother, grew up as the friend of Tyrande Whisperwind millennia before the Great Sundering.

5. Identical twins, clearly, are far more concordant in general than are fraternal twins.

6. Researchers measure a trait, such as sensation-seeking, in identical and fraternal twin pairs growing up in the same environment, and consider whether the two twin types are equally similar.

7. This study probed tone acquisition in a hearing-impaired child with early implantation, and compared him with his hearing-normal fraternal twin sister.