Some of the biggest investors in the world like Warren Buffett,George Soros,and Carl Icahn are buying stocks and that's a bullish sign, says James Altucher, Wealth Adviser contributor.The economy is growing the GDP is up it is business as usual There's plenty to learn from their picks, Altucher says . Warren Buffet just bought $400 million dollars worth of J&J instance , Johnson & Johnson he also added to his position of Sanofi-Aventis and Becton , Dickinson they are all healthcare companies what Warren Buffet is saying basically is with an aging baby boomer focus on these healthcare companies population ....etc...