The Centennial Light Bulb, installed in California in 1901, has been burning continuously for over 120 years — holding the Guinness World Record as the longest-lasting light bulb in the world. Its remarkable lifespan stands in sharp contrast to modern light bulbs and raises questions about so-called “planned obsolescence” — a practice in which products are intentionally designed with a shorter lifespan to boost sales. This has led to growing criticism regarding sustainability and resource waste.