Natural selection also explains many basic revulsions, such as the horrid smell of rotting meat, or fears, such as the fear of snakes or standing close to the edge of a cliff.

Smoking or salting meat of livestock butchered in autumn was a common household strategy to avoid having to feed more animals than necessary during the lean winter months.

For example, production of a pound of beef cattle live weight may require between 4 and 5 pounds of feed high in protein and metabolizable energy content, or more than 20 pounds of feed of much lower quality.

The Empresa Mecánica del Niquel was obliged to obtain through intermediaries computerized numerically controlled (CNC) welding and cutting equipment made by United States manufacturer Miller. Similarly, it obtained from the United States a Thermadyne Challenger cutting bench. The transactions performed through third parties cost a total of 363,500, representing an additional outlay of 54,500.