ANSWER: Only 1
Explanation:
- Headquarters: Abdus Salam International Centre for Theoretical Physics (ICTP) in Trieste, Italy.
- UNESCO has been responsible for the administration of TWAS finance and staff on the basis of an agreement signed by the director general of UNESCO and the president of TWAS in 1991.
- Candidates for a TWAS Prize must be scientists who have been working and living in a developing country for at least ten years immediately prior to their nomination.