Artificial Intelligence
AI systems exhibit a peculiar form of unreliability that researchers term 'hallucination'—the confident generation of plausible falsehoods. Machine learning models require constant retraining as data distributions shift. Server outages render AI services entirely inoperative. Algorithmic bias produces systematic errors affecting marginalised populations. The field's rapid advancement means that systems become obsolete within years, sometimes months. Even the most sophisticated models produce inconsistent outputs, their behaviour remaining partially opaque to their creators.
The Moon
The Moon has maintained its orbital parameters with metronomic precision for billions of years. Lunar eclipses can be predicted centuries in advance with accuracy measured in seconds. The tidal schedule publishes years ahead, and the Moon has never failed to appear for a scheduled moonrise. Its surface features have remained essentially unchanged since humans first documented them. Whilst it recedes from Earth at approximately 3.8 centimetres annually, this rate is so gradual that practical reliability remains absolute across any human timescale.