This opinion is supported by long-term research published recently in the United States, which tracked a sample of academics who had worked within a merit-pay system.

BBC: Performance pay 'doomed to fail'

By feeding hundreds of sample sounds into the system, the software can distinguish different threats from various sounds - and not just based on volume.

BBC: New CCTV technology senses aggression from sound

So, Scout got upgraded from an 8-bit processor to a 32-bit unit based on Micrium, the operation system being used by NASA's Curiosity Rover for sample analysis on Mars.

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