Exactly how the fish "imprint" the magnetic field near where they were born is unknown, but the scientists believe the change from fresh to saltwater triggers some kind of neurological process.

BBC: Sockeye salmon 'sense magnetic field of home'

"In the way that we've been mapping the landscape, there's been a parallel process about mapping the neurological system, " says Wilson.

BBC: Theatre director seeks change of scenery

Now, however, Lilly is turning to what it knows best: It has an arsenal of new neurological drugs on the way, narrowing the company's focus and hopefully bringing some big sellers in the process.

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