29 April 2011 Last updated at 22:43 ET

Obama shocked by tornado damageResidents push their belongings along a tornado ravaged-area in Tuscaloosa, Alabama

President Barack Obama says he has "never seen devastation like this", after visiting a city in Alabama which has been ravaged by tornadoes, which have left over 300 dead.

Shuttle APNasa delays Endeavour's mission

Nasa has delayed the launch of its Endeavour shuttle by at least three days because of technical problems in the last hours before lift-off.

Student Jason Romero works with stem cell cultures in a labUS court backs stem cell funding

A US appeals court overturns an earlier order to suspend federal funding of stem cell research, marking a victory for the Obama administration.

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