The impact and effect of media are often difficult to underestimate, as orson welles's broadcast of the war of the worlds demonstrated in 1938. this example is used in support of the hypodermic needle, or magic bullet, theory, which suggests that:

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Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.