Conversation so far:
what are the balls in power lines for
The marker balls are placed on power lines to make the conductor crossings visible to aircraft.
when were the balls in power lines introduced
The marker balls first gained popularity in the early 1970s, when Arkansas’s then-governor Winthrop Rockefeller decided something should be done to make them more obvious to pilots.
what is the most common color for the balls in power lines
While red is one of the most common colors used for these warning balls, other colors are also available. The color used is determined primarily by the surrounding landscape.

Question: is it safe to live near lines
Self-contained rewrite: is it safe to live near power lines