Scientists say they have found a new species of Medusae — a type of free-swimming, umbrella-shaped jellyfish. The sea creature — which was first spotted in 2002 in a deep-sea volcanic structure in ...

SELENIUM tetrafluoride was first described in 1907 1, but the compound does not seem to have been obtained pure until quite recently 2. It is not a particularly easy substance to handle, since it ...

IN his interesting communication on the structure of SeF 4 1, Mr. Bowen writes: “Only one model was found to give satisfactory agreement with the visually estimated ring intensities. This model has a ...