Our investigation into "raiteros" in Chicago with Propublica airs, looking into the bussing of temp workers around the city. Plus, where, oh where has the helium gone? It turns out the reserve’s low prices are a culprit in the looming shortage. Prices for the stored helium undercut the production of new helium and we take a look. We also look skyward to the new WTC1 in New York City. Are the four towers going to be economically viable?