(This is the text of my speech to the KBS/BSTAI Awards a few weeks ago. It was a lot of fun and thanks to the organisers for inviting me to speak).
A contradiction happens when opposing ideas are combined.
In 1519 Hernán Cortés journeyed to what is now Mexico. He caused the fall of the Aztec empire, using guns, germs, and steel. Cortés did that for gold. The Aztecs could not understand why Cortés wanted this useless soft metal. He told them he had “a disease of the heart that could only be cured with gold”.