Albert Einstein used to say that you haven't really understood something if you can't explain it to your grandmother....

Let me introduce myself. My name is Marco, I am 23 years old and I am in my third year at the Physics Department at the Bicocca University in Milan. I think I am a simple person, for whom happiness lies in small things, but I am also very curious. It is precisely this curiosity of mine that led me both to my choice of university faculty and to travelling a lot. In order to be able to afford to travel, and to have my own economic independence, as is often the case, I started to help young people with private lessons in physics, mathematics, English, Italian and other subjects. The gratification of my students' progress then motivated me to continue on the road to teaching. During my high school years I participated in school holidays and work abroad: all experiences that significantly 'enriched' me, while at the same time reinforcing my conviction that travel and cultural/linguistic exchange are fundamental opportunities for growth and for the development of thinking that is always open to comparison and constructive criticism. With the same awareness, I participated in the Erasmus mobility project where I took exams in English. Now, for personal reasons, I am often in the USA where I take physics courses in English. During my various stays abroad, I have been pleased to note that many Americans in