This week, the President got a head start on his Small Business Saturday shopping, took action to build trust between communities and local police, got a firsthand look at the ground-breaking scientific research behind the American-made Ebola vaccine candidate now in clinical trials, hosted the annual Tribal Nations Conference and the second-ever College Opportunity Summit, and last but not least, helped light the National Christmas Tree. That's November 28th to December 4th or, "Multiparameter Flow Cytometer.
Fonte: White House