In Livermore, California, a humble light bulb has been glowing almost non-stop since 1901 — over 120 years! Known as the Centennial Light, this dim, carbon-filament bulb was built to last, unlike most modern products. Its extraordinary lifespan fuels debates about planned obsolescence — the practice of designing products to wear out faster so consumers must buy replacements. In the 1920s, the infamous Phoebus Cartel even limited bulb life to 1,000 hours. While modern bulbs are brighter and more