Hello Mister Thibauld. I'm Mario De Martin, I do not know if you remember me. I was a student to whom you taught in 1971. Adult Educations. Summer 1971 Windsor (Canada) Eire street. I asserted that it was the Italian Antonio Meucci invented the telephone while everyone said (you and other students) that it was Alexander Bell! You called me since then Antonio and not Mario! LOL! I live in Italy since 1972. For you all right? I see that you've become an important person! Congratulations