Decreases in divergent thinking across age groups from 2005 to 2018 amongst school children in Sudan oleh Salaheldin Fararh Attallah Bakhiet, Edward Dutton, Hatim Abdelrahman Warrag Ali, Guy Madison, Homoud Abdullah Saad Almoghyrah, Sultan Howedey Sultan Al-Mutairy, Yossry Ahmed Sayed Essa, Abdulelah Abdullah Saleh alruwaitea, Abdulrahman Saad Rashd Aljbr