Two hundred years on from the birth of Charles Darwin, our science correspondent David Shukman travels to the Galapagos Islands where the great 19th Century figure made observations critical to his theory of evolution.

A series of stamps is to go on sale commemorating the British scientist Charles Darwin, 150 years after the publication of his seminal work on evolutionary theory - On the Origin of the Species.

Charles Darwin's home, Down House , in Kent, is set to reopen to the public this week with a new permanent exhibition marking the bicentenary of his birth.

L'année 2009 est l'occasion de commémorer le bicentenaire de la naissance de Charles Darwin - né le 12 février 1809 - et les 150 ans de L'Origine des espèces. De quoi rendre hommage à sa démarche scientifique, selon Daniel Cherix, conservateur du musée de zoologie de Lausanne.