What does half-life mean?

 The French Connection

Nuclear Power

Scientists talk about nuclear elements having a half-life, what does that mean?

In broad terms it means that in X number if years, HALF of the radio-active element SHOULD be classed as safe. This does not mean the other half should be safe in another span the length of time, as the half of the element left now has its own half-life. Those elements have a half-life going into thousands of years, when, if ever shall they be safe?

Nuclear Power is an endless poison.

Here is a thought, Nuclear in an anagram of unclear, as scientists are unclear of the safety of the power