Report: Ozone levels drop 20 percent with switch from ethanol to gasoline

A Northwestern University study by an economist and a chemist reports that when fuel prices drove residents of São Paulo, Brazil, to mostly switch from ethanol to gasoline in their flexible-fuel vehicles, local ozone levels dropped 20 percent. At the same time, nitric oxide and carbon monoxide concentrations tended to go up.

Could microbes live in Martian brine?

A new million-dollar NASA project led by the University of Michigan aims to discover whether drops of salt water are common on Mars - and whether microbial life could survive in them.