What things are worth more than gold?

The 10 unknown things that are much more valuable than the GoldCaterpillar mushroom. The first is recovered as a by-product of the typical spent fuel in a nuclear reactor, after the fuel has been irradiated (“burned”) for about three years. The second is manufactured especially for military purposes and is recovered from uranium fuel that has been irradiated for only 2 or 3 months in a plutonium production reactor. The two types differ in their isotopic composition, but both should be considered a potential proliferation risk and managed accordingly.