Tributes to Aretha Franklin, "Queen of Soul"

The singer Aretha Franklin has died aged 76. The former US president Barack Obama says that she helped define the American experience.

Also on the programme: The complete wheat genome has been published - it is hoped that scientists can use it to develop new, more resistant strains of the crop; and the second part of an investigation into rhino poaching in South Africa

(Picture: Aretha Franklin performs at the Rockefeller Center, New York City in December, 2009. Credit: George Napolitano/FilmMagic)