What happens if I'm exposed to radioactive material?

Radioactivity—which describes the energetic disintegration of atoms—is a constant presence in our lives. There are radioactive gases in the air we breathe, and even our own bodies contain naturally occurring radioactive ...

Diseases, Conditions, Syndromes

Harmful pollution boosting superbug 'silent pandemic'

Containing and cleaning up environmental pollution, especially in waterways, is crucial to controlling increasingly bullet-proof superbugs which could kill tens of millions by mid-century, a new UN report said Tuesday.

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Heavy metal (chemistry)

A heavy metal is a member of an ill-defined subset of elements that exhibit metallic properties, which would mainly include the transition metals, some metalloids, lanthanides, and actinides. Many different definitions have been proposed—some based on density, some on atomic number or atomic weight, and some on chemical properties or toxicity. The term heavy metal has been called "meaningless and misleading" in an IUPAC technical report due to the contradictory definitions and its lack of a "coherent scientific basis". There is an alternative term toxic metal, for which no consensus of exact definition exists either. As discussed below, depending on context, heavy metal can include elements lighter than carbon and can exclude some of the heaviest metals. Heavy metals occur naturally in the ecosystem with large variations in concentration. Nowadays anthropogenic sources of heavy metals, i.e. pollution, have been introduced to the ecosystem. Waste derived fuels are especially prone to contain heavy metals so they should be a central concern in a consideration of their use.

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