“…According to Staley, the title for the album came
from a science experiment Cantrell conducted in third
grade: “They gave him two jars full of flies. One of
the jars they overfed, the other jar they underfed.
The one they overfed flourished for a while, then all
the flies died from overpopulation. The one they
underfed had most of the flies survive all year.
I guess there’s a message in there somewhere.
Evidently that experiment had a big impact on Jerry.”…”
Wikipedia