Dr. Michael Greicius, a Stanford University neurology professor, tells Rachel Maddow about the harmful impact he believes President Trump's National Institutes of Health budget cuts will have on decades of scientific research. Regarding getting a definitive treatment for Alzheimer's disease, he says that could be a five year window "or if we really handicap the research infrastructure that could be, you know, back to 20 years." For more context and news coverage of the most important stories of