In that case, explore those realms, and see what opportunities arise. My career has been successful largely because of my domain knowledge, in a few different

In that case, explore those realms, and see what opportunities arise. My career has been successful largely because of my domain knowledge, in a few different domains-- but it's all come about accidentally. I've just kept my eyes open, tried to soak up the things that interest me, and (most importantly), tried to see how I could apply the knowledge in new ways. Put another way: don't wait for some guy to come up to you at a party and say "Plastics."