My son and my nephew were recently handed novelty light pens to amuse them during a trip to a local pub. The pens were cool enough — standard promotional items that would make we want to buy a stapler, or a bed pan, or consulting, or something, from some company or another (boy, does that corporate strategy work or what?). The thing that raised my eyebrows was the claim written on the side that the lights would work for “300,000 hours.” 300,000 hours. That’s 34 and a quarter years. How do they know this?