Road de-icing, industrial activity and other culprits are pushing salt levels in rivers and streams to alarming levels
Arctic predators have been eating twice as many shorebird eggs, threatening populations and potentially migration itself
Blood relations may be the key factor for mole rats, meerkats and others. But how do humans fit in?
Scientists have evidence that El Niño boosts CO2 levels, and they are pinning down how
Studies of humans and other animals indicate that inventiveness often stems from factors other than need