Inventions listed by category

Recreation:
Airfish , Aquavision , Camper , Concrete manatees , Jildo , Mercenary chess , Nature clock , Pocket randomizer , Rail bike , Research , Tetratact , Wobble

Environment:
Agrifoam , Concrete manatees , Cyclone trashburner , Drip bucket , Habicell , Nature clock , Outshiner , Rail bike , Sequestering Concrete , Sky well , Whisper zone

Consumer products:
Airfish , Aquavision , Blink light , Camper , Combination knob , Hello box , Jildo , Nature clock , Outshiner , Pocket randomizer , Radar deflector , Quick mitten , Tetratact , Wobble

High tech:
Blink light , Buzz filter , Grain scanner , Habicell , Hello box , Nature clock , Pocket randomizer , Sonic eye , Voplane

Low tech:
Camper , Chaos Code , Concrete manatees , Cyclone trashburner , Drip bucket , Jildo , Mercenary chess , Quick mitten , Rail bike , Research , Whisper zone

Computers & electronics:
Attitude matrix , Audiopilot , Blink light , Buzz filter , Grain scanner , Hello box , Nature clock , Pocket randomizer , Sonic eye , Tetratact , Wobble

Transportation:
Airfish , Audiopilot , Automotive ideas , Concrete manatees , Habicell , Platform control , Radar deflector , Rail bike , Voplane

Construction:
Agrifoam , Combination knob , Concrete manatees , Habicell , Outshiner , Sequestering concrete , Sky well , Whisper zone