Millions of people worldwide are exposed via soil and water to arsenic, whether naturally occurring or related to pollution. Chronic exposure is linked to the formation of cancer stem cells.
The mystery surrounding a forgotten marine mammal, a remote archipelago and man-made pollution.
Gamma-ray bursts occur when a massive star explodes or when two neutron stars merge. A newly discovered burst has puzzled astronomers, as it lasted much longer than astronomers would have expected.
Pollution from more frequent floods and wildfires – exacerbated by the warming climate – is threatening human health and poses particular risks to the brain.
Reports from baby food companies show questionable levels of arsenic, lead and other heavy metals. Here's what parents need to know.
Baby foods with rice or root vegetables, like carrots and sweet potatoes, had some of the highest levels, but they weren’t the only ones.
Dams built to hold enormous quantities of toxic mining waste have a long history of spills. Decisions in the Pacific Northwest threaten three free-flowing rivers there.
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