As cases of a new coronavirus variant are confirmed around the world, Japan announced Monday that it will suspend entry of all foreign visitors, joining an increasing number of countries that are tightening their borders as fear spreads of yet another extension of pandemic suffering. Japan, which has yet to detect any cases of the recently identified omicron variant, reimposed border controls that it eased earlier this month for short-term business visitors, foreign students and workers. Despite the global worry, however, scientists cautioned that it’s still unclear whether omicron is more dangerous […]