FAQ

Korean. When Lucy is listening in on the phone conversation with Del Rio she says they are speaking Korean.

Richard didn't tell her anything of use that she could use to track down the original source. Besides, it was irrelevant. She was only interested to collecting the three other pouches on the way to Europe.

This is a classic case of what is known as a Contrived Convenience. Presumably whoever gave the briefcase to Richard would have had it handcuffed to him, otherwise there is no reason for it to be there in the first place. However, in order to make the story work, Richard has to be able to handcuff the case onto Lucy's arm, otherwise she won't deliver the briefcase. If it is already attached to Richard (and he's unable to remove it) and Lucy leaves, the movie is over in five minutes.

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There is no evidence that humans only use 10% of their brain and that it can be increased. Scientists point out that if it were then some brain damage would have little effect or only affect certain functions, but even minor damage has profound effects. Also the brain (and organism in general) try to work as efficiently as possible. Therefore neuronal networks are destroyed and reabsorbed if they are not used anymore (thats why you may forget a language that you hardly use).