by Vera H-C Chan Hold that razor: You may not want to shave your head just yet. As engineers and technologists figure out how to stem the oil leak in the Gulf of Mexico, volunteer efforts to sop up the spill have been decidedly low-tech. Outlets like NPR have been reporting us that hair make the best oil containment booms, which means Lady GaGa could probably save a wetland by taking a dip with her beehive. People are fast catching on,