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Resistors
Components that control current in electric circuits to prevent damage from high current by converting electrical energy into heat.
Food Preservation
Methods to make food safer, improve quality, and extend freshness, including cooking, freezing, pickling, drying, and pasteurization.
Microorganisms
Bacteria and mold that cause food to spoil.
Grain Conservation
Storing staple foods in silos or at home, dried to prevent rotting, and protected from pests.
Pickling
Preservation method where food is stored in brine to prevent microbial growth.
Curing and Drying
Preservation method using salt to prevent spoilage, examples include Biltong and Dipabi.
Metal Preservation Methods
Techniques to protect metals from rust, including painting, galvanizing, and electroplating.
Plastics
Versatile materials split into thermoplastics (recyclable) and thermosetting plastics (not recyclable); their pollution can be mitigated by reducing, reusing, and recycling.
Note 
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