The Williams Formula One team have unveiled their new drivers.

Brazilian driver Rubens Barrichello joins the team from Brawn having finished third in last years World Championship.

He's joined by F1 rookie Nico Hulkenberg who arrives from GP2 - the traditional training ground for Formula One.

Rahul Pathak reports from Doha, where Williams are setting up a new technology centre. 

Source: Al Jazeera