"it slowly dawned on me that the landscape of science is maybe what interests people a great deal in science fiction."
At this point in the novel, many people fear contagion. For this reason, machines that make use of face recognition biometrics are used in place of human beings; the automated sentry is a biometric identification system. Ironically, face recognition is probably the oldest means that humans have of recognizing each other.
This is one of many places in the book where machines are used to sense danger. In a way, the automated Sentry is an analogy to the biological laboratory devices used in the story. The fact that "normal" people use mechanical devices to sense what other people are, and where danger is, forms an interesting counterpoint to the "virus children", who use their own capabilities to judge others.
Want to Contribute an
Self-Driving Truck Corridor From Manitoba To Mexico?
Maybe this would be safer...
Electronic Tongue Knows Beer Better Than You
'Install taste buds in the end of one tentacle.'
NASA's Robotic Mining Competition
''Dave,'[Powell] said. 'You're a stable, rock-bottom mining robot...'
Should Humanity Switch To Robotic Pets?
'What about an exact electric duplicate of your cat?'
L'Oreal To 3D Print Human Skin
'...She helped the doctor spray on surrogate skin.'
LG Display Creates OLED Wallpaper
'A television that unrolled like a poster...'
Cool Foldable Mini-Quadcopter
'Eddie pocketed the bee cam...'
NASA's Subvocal Speech System
'She took a subvocal input device from its rack...'
Cicada UAV Dropped In Swarms
'We... dropped roughly a thousand eyes on Beta Hydri IV.'
AI's Now Being Taught Anger
Actually the Prime Radiant was just a display device.
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