Hello, my name is Marcos. I am 18 years old and I am from Argentina. I am going through quite a struggle deciding between Physics, Engineering(specifically Aerospace Engineering) and biology.The reasons for my interest in physics are: I would love to carry out research(I like science), I like being able to understand a little about everything and the world that surrounds us, I have a great interest on space. Reasons for my interest on Aerospace engineering: It is a "safer" major in terms of employment and money, I might be able to do complex things in relation to space, It has advanced physics. Things I like about biology: stem cells, genetics and neuroscience. The problem is here in Argentina research is almost non existant. So, I will have to leave my country to the US (still being hard) In both I am planning to try hardly to achieve a Phd. What is your advice? Thanks a lot for your time!