<a href="https://news.google.com/rss/articles/CBMimAFBVV95cUxNS2kzM3ZVLXRBU0ZrcE…; target="_blank">Here's How Long the Average S&P 500 Bull Market Lasts, According to History. Should Investors Be Nervous?</a> <font color="#6f6f6f">The Motley Fool</font>