Obama orders the world's fastest super computer

The president of the United States has signed an executive order for the US to build the world's fastest computer by 2025.

China currently have the world's fastest machine but the machine ordered by Mr Obama will be 20 times quicker. It would be capable of making one quintillion (a billion billion) calculations per second.

The NSCI ( National Strategic Computing Initiative) will be newly set up to gather research and assemble the machine.