Several factors contribute to the rise in multiple births, including the rise of assisted reproductive technology (ART) since the 1970s, increased use of contraception and mothers giving birth at an older age, when twinning rates are higher.
Scientists decode genome of Earth's largest predatory fish, a knowledge they say could help combat cancers and age-related diseases in humans.
Chinese scientist He Jiankui says his university plans to monitor newborn twin girls from a gene-editing programme for the next 18 years and another volunteer is currently pregnant.
Doctors treating a critically ill boy with a devastating skin disease used experimental gene therapy to create an entirely new skin for him.
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