Engineering questions

<li><p>My friend told me that “average” doctors make more than “average” engineers, but that engineers have potential to make much, much more than doctors. How true is this statement? What is the risk-reward ratio in engineering?</p></li>
<li><p>What undergrad engineering major would fit best for:
-nanotechnology
-energy (especially in the renewable energy sector)</p></li>
<li><p>What are the emergent/upcoming technologies and innovations that will affect people and the world the most in the next fifty years?</p></li>
</ol>

<p>P.S. I’m not obsessed with money. I just want to get the facts straight.</p>