Swarms of midges have become a headache at the World Exposition in Osaka, causing visitors to cringe and raising concerns about possible health issues.The small flies have been found on walls and the pillars of the wooden Grand Ring encircling many of the pavilions, with people forced to fight them off to avoid swallowing them."It shocked me when they landed on the bread I was eating. There are so many of them around and it's disgusting," said Toma Masatani, a 23-year-old graduate school student visiting the expo with friends from Saitama, near Tokyo.While the midges at the expo do not bite…READ FULL ARTICLE