In this edition of Tech It Out, we review our special series "Science Behind Virus," finding out how long it will take scientists to develop a vaccine for COVID-19.

On Science Saturday, we review the major science news of the past two weeks, including China sending the world's first 6G test satellite into orbit, Pfizer and BilNTech saying their COVID-19 vaccine is 90 percent effective, China's "Fendouzhe" submersible setting a record 10,909-meter dive, and the Long March-5 carrier rocket's plan to launch the Chang'e-5 probe.