I tend to get a bit flighty after stocks make big gains, wondering if I should cash in or at least shift toward a hold-wait-and-see territory. First Solar, Inc. (NASDAQ: FSLR ) is up nearlyMarkets rise and fall, booms come and go, and the world keeps ticking. Ultimately, I believe observing megatrends, as difficult as they can be to spot, let alone fully comprehend, can yield insights into the advance of human society, which in turn could pave the way for many useful investment insights. As society and tech ...