HELSINKI — China launched its Long March 10B rocket early Friday and successfully recovered the first stage, marking a huge step for the country’s reusable rocket efforts. The first Long March 10B rocket lifted off at 12:15 a.m. Eastern (0415 UTC) July 10 from Hainan Commercial Space Launch Site on the southern island province of Hainan. The China Aerospace Science and Technology Corporation (CASC...