The document discusses the possible health effects of nuclear crises and radioactivity. It describes accidents at Fukushima and Hiroshima/Nagasaki that exposed many people to radiation. Radioactivity can cause nausea, dizziness, hair loss, leukemia, various cancers, and other sicknesses by exposing people to poisonous radioactive substances like uranium, potassium, and iodine. The conclusion is that radioactivity has extensive negative impacts on human health.