I love how people think there is no data and research behind the vaccine. First of all Google doesn't make any of us an expert. Second, they've been working on the vaccine technology since the original SARS outbreak in 2002-2004, but because there was no current outbreak at the time it received low priority funding. Otherwise the vaccine would have taken years to develop. It happened as fast as it did because they had a head start. It is safe. But by all means, put on your tin foil hat, sail to the edge of the Earth and wait for the aliens to come because, you know, you Googled it.