Small volcanic eruptions could be slowing global warming by spewing sulfur aerosols that reach the upper atmosphere and reflect sunlight away from the Earth.
Twitter began letting users search through every tweet publicly fired off at the globally-popular one-to-many messaging service since it launched in 2006.
Babies adopted across international borders may not remember the language they heard in their first days, but the words leave a lasting mark on their minds.
US aid worker Peter Kassig's parents said they were "heartbroken" by the death of their son, after his beheading by Islamic State militants was shown in a video.
President Barack Obama said the United States cannot "carry the world economy on our back" and urged G20 leaders to work harder to create jobs by revving up growth.
Microsoft released a test version of Skype that lets people make Internet calls from web browsers, eliminating the need to install special applications.
Facebook said it is making moves to reduce the number of promotional posts that pop up in timelines, in response to users' demands for fewer advertisements.
Hollywood's A-listers gathered in Los Angeles for a film festival that may not be well known but nonetheless shines an early spotlight on awards season.