Levels of molybdenum in soil show that hydrogen sulfide gas wiped out nearly half of all marine life 530 million years ago.

A VERY few elements constitute all save a minute fraction of the material of which plants and animals are made; but the small residuum contains a considerable, even a large, number of elements, stored ...

Refractory metals are a class of metallic materials that offer superior heat resistance and very high melting points. While the exact definition of which elements are included in this group varies, ...