A few days ago my husband and I were in the demonstration room of an electronic plant belonging to a friend in Menlo Park, California. There we marveled over the new inventions for analyzing air pollution and counting the particles in water and other liquids. It is now possible to put on one’s belt a small box (about five inches square and a couple of inches thick) that measures air pollution, giving fair warning of a dangerous situation.

This is marvelous in mines, for instance, where in years gone by the only indication that the air was dangerous to breathe was the discovery that the canary taken as a “test” down into the place where the men were working had died. Now the canary does not have to die to show that the air is too polluted to breathe; a trustworthy device can go right along with the workers to make a continual test.

We saw also an amazingly compact machine that throws a laser beam through liquid and counts its particles. As if by magic, numbers appear on a screen, rapidly changing as the count takes place, until the total number is reached. That number then stays without a flicker of change until the liquid is removed and another one is put in the place of scrutiny.

It is a good thing to be able to measure pollution in air and water, but there is another, non-physical form of pollution that must not be neglected as we concern ourselves with physical dangers. Jesus gives a warning in Matthew 10:28, “Fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.” This dangerous one has many prophets, or teachers, who spread pollution that fills not only books, magazines, and other media for spreading ideas but also the conversation ...

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