science

... Prisoners of war must at all times be humanely treated. Any unlawful act or omission by the Detaining Power causing death or seriously endangering the health of a prisoner of war in its custody is prohibited, and will be regarded as a serious breach of the present Convention. In particular, no prisoner of war may be subjected to physical mutilation or to medical or scientific experiments of any kind which are not justified by the medical, dental or hospital treatment of the prisoner concerned and carried out in his interest. ...

... Prisoners of war shall be allowed to receive by post or by any other means individual parcels or collective shipments containing, in particular, foodstuffs, clothing, medical supplies and articles of a religious, educational or recreational character which may meet their needs, including books, devotional articles, scientific equipment, examination papers, musical instruments, sports outfits and materials allowing prisoners of war to pursue their studies or their cultural activities. ...