Portal: Real-life turret sings and senses intruders

Portal 2 Easter egg guide: 30 secrets and references you may have missed
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Slow news day leads to Portal 2 adoption %26ldquo;controversy%26rdquo;
Valve %26ldquo;just passing the buck,%26rdquo; says WBTV news anchor

Robotic engineer builds Portal 2 Personality Core replicas
Miniature Nolan North not included