The chemist Luis Manuel Liz Marzán, born in Vigo 57 years ago, spies on cells. The listen with nanostars (nanomaterials created with gold and silver, mainly, smaller than 100 nanometers or one billionth of a meter) to understand their intentions and strategies. Its objective is to investigate how to intervene, with the same nanomaterials, in case the result is a tumor, a neurodegenerative disease or an infection, the greatest challenges facing humanity in the field of health. He has been one of the most cited scientists in the world for almost a decade and his list of recognitions is immense. Lead the group of Bionanoplasmonics from the San Sebastian research center CIC Biomagune, is a professor at the University of Vigo, principal investigator at the Center for Networked Biomedical Research, Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN) and, this month, he will be invested as a doctor honoris causa from the University of Antwerp (Belgium).