Our alert systems for identifying safety and security threats have evolved over time. As the threat from wild animals diminished, the perceived threat from other humans increased. To defend our territories and our livelihoods, we began to gather intelligence on our enemies, in the hope that being forewarned would give us an advantage. This lecture explores our use of technologies that have allowed us to keep a closer watch, and the ingenious methods that have been used to counter them.
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Gresham College
