Freshwater is getting saltier, threatening people and wildlife
Road de-icing, industrial activity and other culprits are pushing salt levels in rivers and streams to alarming levels.
How tear gas works: A rundown of the chemicals used on crowds
There are two broad types of tear gas—and they’re both engineered to cause pain.
From pine cones to hobbit holes, mimicking nature can help humans adapt to wildfires
One of the biggest reasons wildfires are creating such huge disasters in recent years is the expansion of the West’s population into fire-prone wildland areas.
How do bomb squads assess a suspicious package?
Explosives experts use a combination of x-ray scans, chemical swabs and other tools to evaluate the parcel.
Traces of the Apollo astronauts’ presence lingered long after they left.
To know what a wildfire might do next, researchers need to know how an inferno interacts with the atmosphere.
New findings give some weight to the idea that life was blasted here from another planet.
A federal study aiming to collect the health information of one million U.S. residents is limited by the very problems it hopes to solve.
Solar geoengineering would ease heat stress, but also block vital sunlight for plants, according to a new study published Wednesday.
