President Barack Obama and First Lady Michelle Obama have led a ceremony of remembrance at the White House on the 11th anniversary of the 9/11 terrorist attacks.
More top news
Planets outside our solar system could have earth-like oceans, evidence suggests. Could it mean a higher chance of extra-terrestrial life?
Prince Harry has waved goodbye to the people of Australia after a one-month attachment - meaning he will soon be united with his new niece.
Nearly a quarter of children in the UK under the age of five are overweight or obese, according to researchers.