Thanks to innovative chemical treatments, the ball serves as a cage that hides the enzyme from the immune system until it gets to its target tumor, where an anti-cancer drug is released.

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Pointless, tedious waiting in a crowded cage with dead roaches and no running water, where officers processing you through the system laugh at your discomfort and fear.

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The researchers hypothesized that if the stimulation to the limbic system were unpleasant, the rats would stay away from that part of the cage.

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In their experiments, an electrical current was sent to the limbic system of a rat's brain whenever it moved to a certain area of its cage.

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