Pioneering computer scientist led the development of the software for Nasa's Apollo mission and was awarded the Presidential Medal of Freedom.

Sir David says the series uncovers marine life that is "even more precious than we ever realised".

Climate change is blamed for dramatic decline of chinstrap penguins living on a remote volcanic island.

El Niño has led to an eerily quiet season so far but the first Atlantic hurricane of the year is now set to impact the southern USA.