Stock futures were little changed Tuesday after major equities indexes pulled back for a second consecutive session. Meanwhile, gold and silver prices rebounded after a one-day selloff.  Nasdaq 100 and S&P 500 futures pointed 0.1% lower apiece and those affiliated with the Dow Jones Industrial Average were down fractionally, a day after stock indexes ended lower to begin a holiday-shortened week. The tech-heavy Nasdaq, blue-chip Dow Jones Industrial Average, and benchmark S&P 500 finished down a respec ...