Ten Years of the Chornobyl Era Questions

1) What is radiation and how can it affect the human body?

2) How was the Chornobyl disaster caused?

3) How many times more radiation was let out during the disaster than in the Hiroshima bombing? How much radiation was let out?

4) How many square kilometers where contaminated? What countries where affected?

5) What is being done to stop the radiation from spreading?