1.   A uranium atom may have indeed decayed, spilling the poison, but it will be our observation that kills the cat.

2.   The uranium atom can be simultaneously decayed and undecayed and the beryllium atom can have its electron spinning both clockwise and counterclockwise.

3.   Uranium atoms split by nuclear fission form hundreds of different types of fragments, most of which are radioactive.

4.   While they take thousands of years to lose radioactivity, most of the fission products, which are the fragments of split uranium atoms, take hundreds.

5.   Physicist Lise Meitner determined the uranium atoms had split.