Gasoline

The main federal fund for roads and bridges runs at a deep deficit. If even red states can raise the gas tax, why can’t Congress?

• By Alec MacGillis

Gradual advancements in the art and science of fire investigation continue.

• By Lauren Kirchner

In California, hydrogen-fueled cars are gaining in popularity. Will their safety issues garner greater scrutiny?

• By Naveena Sadasivam