Mono-di twins share a placenta, which means they need extra monitoring to make sure they're getting enough nutrients and ...

Globally, mothers are having fewer children. Yet despite this latest observed decline in birth rates, the number of twins and triplets being born today is higher than ever before. This is the ...

THE paper by Messrs. Carpenter and Tamura in the November number of the Proceedings of the Royal Society, on "The Formation of Twin Metallic Crystals," presents a picture of the twin boundary ...