We have an extended report by Kara Lofton on the UVa-Guatemala Initiative, an effort by a group of doctors in Charlottesville to provide aid to Guatemala's overcrowded, underfunded health care system.... Jordy Yager gets Eric Cantor's thoughts on politics, tolerance and Congress.... Brit Moorer gets a demonstration of the "MadiDrop," a tablet its inventors hope will help purify water in the world's poorest places.... and Emily Richardson-Lorente introduces us to the teachers who are working to get girls excited about STEM.