||They managed to find a different spin on the aliens investigating Humanity. Instead of the usual set-up experiment, they were trying to understand Human behaviour in a similar way to zoologists observing animals. It has more scientific validity than other methods seen, a much bigger sample size for a start. Quite cleverly, it manages to cover both the reactions of the observers to the test (zoologists CANNOT interfere, and many find it hard) and how the regular characters dealt with the disease. The silicon-based virus is the weak point, and not just because of McCoy's disbelief about silicon-based life. In reality, any virus can ONLY reporduce using a compatible host unless it mutates (look at the trouble H5N1 has with Human-Human transmission). If we suspend disbelief about this, then the story does work. Having some convincing acting helped. Anthony Montgomery had far more to do than usual with his extra work, and Linda Park was convincing enough holding the story together. Normally, the patient just has to lie there. She had quite a lot to do with recovering the shuttle, all the discussion about her past, then breaking out of quarantine in a delerium, and this all worked. Overall, a fairly decent episode.