Radium

Pierre and Marie Curie succeeded in isolating polonium and radium from uranium. In order to do so they had to work with a considerable amount of pitchblende, an ore from which uranium can be extracted.
So it is today. There exists a great amount of "pitchblende," referring to all of those who profess belief in the Lord Jesus Christ. God loves His believers, and if they persist in their hope they will be saved in the Day of the Lord.
While being saved in the Day of the Lord is of the greatest benefit to any person, it does not solve God’s problem—the problem of rebellious angels and people. In order for the problem of rebellion to be solved there must be found in the mass of believers a quantity of "radium"—people who will give their all that God’s will might be performed throughout His creation.