The bigger and maybe smarter market

They're not quite as sexy as stocks, but bonds are a much much bigger market than stocks. And when bond market participants see something different from the stock market, it is important to take notice. That leads me to a couple of articles, one from an investment manager and another in a more popular publication.
Something is about to give
Bond market jitters return

I won't go into details as both those pieces are pretty well written. But I will include a graph which sits at a critical juncture. The yield falling below 3.8% indicates severe flight to safety, and the spread from other rates like mortgage, investment grade bonds, etc. show extreme strain.