China has claimed the top spot on the list of the world's supercomputers.

The title has gone to China's Tianhe-1A supercomputer that is capable of carrying out more than 2.5 thousand trillion calculations a second.

By Maggie Shiels
Technology reporter, BBC News, Silicon Valley

Google is taking on internet telephone companies like Skype by allowing users to call from its free web-based email service.

Memristors 17 memristors captured by an atomic force microscope

The fundamental building blocks of all computing devices could be about to undergo a dramatic change that would allow faster, more efficient machines.

Microsoft has launched the latest version of its mobile phone operating system, called Windows Phone 7 series.

The software has a redesigned user interface and incorporates many Microsoft services such as Xbox LIVE games and the Zune music service.