Max Pearson presents a collection of the week’s Witness History interviews from the BBC World Service.

We hear about the moment Dr Max Perutz discovered the haemoglobin structure.

Our expert is Professor Sir Alan Fersht, who is a chemist at the Medical Research Council Laboratory of Molecular Biology and knew Dr Perutz personally.

We also hear about 22 Inuit children from Greenland's indigenous population who were sent to Denmark as part of a social experiment in 1951.

Also, when mixed-raced children from the then Belgian Congo known as ‘métis’, were forcibly taken from their homes in 1953.

When an eruption of violence in Assam led to an estimated 3,000 being killed in the Nellie massacre of 1983.

Finally, the devastating impact of the 2010 tsunami in Chile and a woman who survived it.

This programme contains outdated language which some people might find offensive.

Contributors: Lectures and programmes from the BBC archive Professor Sir Alan Fersht - chemist at the Medical Research Council Laboratory of Molecular Biology. Helen Thiesen - a child in Denmark's Inuit children social experiment. Marie-José Loshi - one of the mixed-race ‘métis’ who was forcibly removed from her home in the then Belgian Congo. Bedabrata Lahkar - a journalist for the Assam Tribune newspaper at the time of the Nellie massacre. Alison Campbell - a survivor of Chile’s 2010 tsunami.

(Photo: Dr Max Perutz and Dr Paul Kedrew. Credit: Hulton Deutsch/Contributor via Getty Images)