A worldwide sell-off in government bonds deepened today, buoyed by rising German Bund yields that recently hit record highs and narrowed their gap with U.S. Treasuries. Benchmark 10-year Bunds now trade at 0.53%, having hit a record low of 0.05% last month, when many expected them to turn negative. The vicious bond market meltdown is also raising pressing questions for investors - is this a correction or merely a trend change?