Radiation can be useful but also dangerous. There are two types - non-ionizing radiation like infrared that is generally safe, and ionizing radiation like X-rays that can cause cancer. Exposure to increasing amounts of radiation causes symptoms from nausea to hair loss to organ damage and eventually death. Nuclear bombs immediately kill many people with radiation, while nuclear plant accidents release radioactive particles that long-term can increase cancer rates. Radiation must be carefully managed to balance its benefits with ensuring public safety.