Fuel injection systems are high-precision electro ... their way into your fuel system from the gas station’s underground ...

If it has direct injection, the fuel mixes with the air inside the combustion chamber. Finally, there may be a return line from where the injectors are situated, which sends excess fuel back to the ...

Last year, a new execution method was used in the U.S. for the first time since 1982. Here’s a look at how people have been ...

This story was produced in partnership with the Pulitzer Center. It is part three in a four-part series. Read part one here ...