In a kitchen in rural South Carolina one night, Hunter Bliss told his mother he wanted to apply to university in Germany. Amy Hall chuckled, dismissed it, and told him he could go if he got in. "When he got accepted I burst into tears," says Amy, a single mother. "I was happy but also scared to let him go that far away from home." Across the US parents are preparing for their children to leave the nest this summer, but not many send them 4,800 miles (7,700km) away - or to a continent that no family member has ever...