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In this edition of Tech It Out, we continue with our "Science Behind Virus" series, explaining how viruses are transmitted to humans.
On Science Saturday, we review major science news of the past two weeks, including NASA's anticipation for the August return of U.S. astronauts; Oldest and largest Mayan monument discovered in Mexico, age of China's oldest-known forest revealed; and proteins from squids that could make human cells partially transparent.