1.   A simple filter based on sand and iron filings could prevent millions of people from being poisoned by the arsenic in their drinking water.

2.   I delight in the blinking cursor, the sound of iron filings being shaken.

3.   One variation of this technique, using buried walls of iron filings, is increasingly being used to remove chlorinated solvents, like dry-cleaning fluid, from ground water.

4.   The water reaches the treatment zones, which are areas of clay mixed with iron filings that destroy the trichloroethylene by dechlorinating it.

5.   Turn it on, and the machine makes a sound like iron filings being shaken in a brown paper bag.

6.   Watching it spin back toward the cup, drawn to it like iron filings to a magnet.