Emerging data indicate that tiny and toxic particles polluting urban air chemically morph from hour by hour, depending on what other pollutants these particles encounter during journeys that can run hundreds of miles.

Federal climate policymakers should have a grounding in basic chemistry.

Uncooked fish can host detectable concentrations of potentially toxic chemicals — pollutants that cooking can make disappear,

These 'atoms' can't leap tall buildings in a single bound, but they have special powers

Oxygen serves as the focus of who to credit with a discovery – and why.

Humans may have been walking around what is now central Mexico 40,000 years ago

Norwegian Academy awards three novel and hefty prizes to three teams of scientists.