Dozens potentially exposed to toxic mercury in Houston spill

Dozens of people in Houston potentially were exposed to the toxic metal mercury after it was spilled outside a Walmart, a Sonic Drive-In and a gas station, officials said. Federal and local investigators were trying to determine ...

Why some greens turn brown in historical paintings

Enticed by the brilliant green hues of copper acetate and copper resinate, some painters in the Renaissance period incorporated these pigments into their masterpieces. However, by the 18th century, most artists had abandoned ...

Phytoplankton use turbulence for travel to social gatherings

Tiny ocean plants, or phytoplankton, were long thought to be passive drifters in the sea—unable to defy even the weakest currents, or travel by their own volition. In recent decades, research has shown that many species ...

page 1 from 3