I´m now 30 years old (born in 1984) and I will be done with my Ph.d. in Nanotechnology in Mexico City. I am planning on getting married with my girlfriend (who is a U.S. citizen) on June 2016 and go live to the United States. I am now thinking what I would like to do after getting done with the Ph.d. I actually don´t know if the Ph.d. will be valid in the U.S. and what can I teach with that kind of degree, since teaching is my real passion. Through this years of study I have noticed that Physics is what I actually really like instead of working to develop technology; for this reason, I am thinking about studying a master´s in physics and probably a ph.d. in physics which would take around 7 years. However, I don´t know if there are good opportunities to teach physics out there and if it is good to get a second ph.d. Can someone give me some advice on whether it is better to stay with my Ph.d. in nanotechnology or to go for the master´s in physics? It is important to say that money is not a problem for me at this point.