Japanese officials will begin strictly enforcing the evacuation zone around the damaged Fukushima Daiichi nuclear plant this week. Scientists say like blood types, humans have three distinct intestinal types as well, affecting everything from diet to weight to susceptibility to disease. With gas prices approaching $4 a gallon, Americans are already saying they will drive less this year, especially those making less than $50,000 a year. Italian carmaker Fiat plans to up its share of Chrysler to 51% some two years ahead of schedule. Self-healing polymers that can actually close cuts to themselves under UV light have scientists excited.