A worm previously used to commit financial fraud is now stealing Facebook login credentials, compromising at least 45,000 Facebook accounts with the goals of transmitting malicious links to victims’ friends and gaining remote access to corporate networks.

The security company Seculert has been tracking the progress of Ramnit, a worm first discovered in April 2010, and described by Microsoft as “multi-component malware that infects Windows executable files, Microsoft Office files and HTML files” in order to steal “sensitive information such as saved FTP credentials and browser cookies.” Ramnit h...

For all the heat they take from critics, automakers have done a remarkable job increasing the efficiency of automotive drivetrains. Technological advancements like turbocharging, direct injection, variable timing and dual-clutch transmissions with seven or more gears have helped squeeze more miles from every gallon of gas.

There’s just one problem: These engines are powering ever heavier, ever more powerful automobiles. As a result, the technological advancements of the past 30 years have brought only small gains in real-world fuel economy, says MIT economist Christopher Knittel.

This would...