NEW YORK (TheStreet) -- Here are 10 things you should know for Tuesday, Oct. 21: 1. -- U.S. stock futures were higher and shares in Europe roseabut stocks in China declinedaas above-forecast China GDP growthadampened hopes for new government stimulus. Japan's Nikkeia225 fell 2%.aHong Kong's Hang Seng added 0.1%. 2. -- The economic calendar in the U.S.