FEW attempts have been made to maintain (or grow) animal tissue cells in protein-free media, although it has been shown 1 that the low molecular weight substances of blood plasma are of the utmost ...

A hybrid embryo is a mixture of both human and animal tissue. There are several types of hybrid embryo (listed below), but recent controversy has focused on cytoplasmic embryos. These are created ...

An analysis of a 30,000-year-old fossil vulture from Central Italy has revealed for the first time that volcanic rock can ...