Our concentration was broken by Mary knocking on the door, opening it she said she be about 2 hours, as she had to go into town and have her hair done... we said we where going swimming and see her later. It was now a roasting hot day, Sally and I had decided because no one at home, her mum out for next two hours minimum and her dad at work, skinny dipping was in order, no neighbours to spy on us only in towels we run down to the pool and jumped in, I felt my nipples go hard it felt amazing.. They implanted electrodes in the brain of mice that would give them a pleasurable feeling whenever the mouse pressed a bar. As predicted, if the mouse received this feeling every time they pressed the bar, they would press the bar regularly. What was interesting is that if the pleasurable feeling came at random presses of the bar, the mouse would continuously press the bar without stopping. The uncertainty of when the next successful bar press occurred meant that the mouse had to keep trying. More

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