... My main scientific interests include supernovae and supernova remnants, diffuse matter in galaxies (HII regions, molecular clouds and star-forming regions, planetary nebulae, and interstellar dust), stellar winds from early type stars, stellar populations (mostly in the LMC, SMC and M51), and cosmology (expansion and acceleration of the universe, primordial stellar populations, and reionization of the universe). ... Urania interviews (in Italian): HST (13 April 2001) , JWST (29 June 2001) . ...