Measuring soot when actually on the road has been a major challenge,, but scientists can now measure the soot content of a car's exhaust while it's on the road.
Scientists used forensic tests to identify the mummified head as belonging to Henri IV, one of France's most beloved monarchs, who was assassinated in 1610.
Justin Gallivan introduces new DNA into bacteria. His technique, similar to cutting and pasting on a computer, lets him pick tasks for the bacteria to perform.
The majority of scientists in the U.S. fall to one side of the political spectrum: Democrat. That's not good for science, said science scholar Daniel Sarewitz.