Learn about uranium, in this clip from Uranium: Twisting the Dragon's Tail. Uranium is an element forged in a supernova - an exploding star about 6 billion years ago. From the debris of this explosion, our solar system formed and uranium is embedded into the earth. Nuclear radition is released from uranium all over earth. Hear how in a 500 year old silver mine in the Czech republic, Derek found uranium, still embedded into the earth and how he used a Geiger counter to measure the radition level.