Rats are used in psychological studies, toxicity tests, in cancer research, in genetics, and pharmacology. Rats are frequent participants in space programs, with their help people study the effects of zero-g on the muscles, skeleton and the reproductive system, the effect of cosmic radiation in living organisms. Rats can detect explosives, weapons, and drugs. They are the heroes of fairy tales, legends and myths. In some countries, rats are cooked as a meal. Torture by rats is considered one of the most sophisticated. Rats are convenient to keep in the city. You can also love them. As a little child I saved a rat from death and ever since I became obsessed with rats.