Twins Reared Apart: Zygotic Division After Artificial Insemination/Twin Research Reviews: Selective Resuscitation of Premature Twins; Scientist Jailed for Editing Twins' Genes; Sexual Arousal Patterns in MZ Twins Discordant for Sexual Orientation; MZ Twins With Jejuno-Ileal Atresia/Media Reports: Twin Girls' Search for a Bone Marrow Donor; Puppy with a Possible Parasitic Twin; Twins in Silicon Valley; Surgical Separation of Craniopagus Twins; Twin-Based New Yorker Magazine Cartoon; Twin Tragedies. (April 2020)