Life Insurance Mortality Tables. Life insurance companies use what is called a Life Insurance Mortality Table (aka actuarial table or life table) to come up with policy rates. This table takes your age and calculates how many years you have left to live if you live to the average life expectancy.
Rust is the normal electrochemical process of metals returning to their natural unrefined state. It occurs when Iron, Oxygen and Water (air moisture) combine. The rusting process can be accelerated when Iron is subjected to nature's minerals, chemicals and temperature fluctuations.
It is not the rust itself causing tetanus. Tetanus is caused by bacterial infection. If you ask, why a wound caused by rusty metals carries tetanus, you need to know that it is not the rust which has something to do with the disease. Instead, it is the bacteria. The spores of Clostridium tetani live in humid, dirty places, such as soil and compost.