"Daniel I. Goldman, a physicist at the Georgia Institute of Technology, and his colleagues, found that the secret to efficient tunnel digging by fire ants was t

"Daniel I. Goldman, a physicist at the Georgia Institute of Technology, and his colleagues, found that the secret to efficient tunnel digging by fire ants was that 30 percent of the ants did 70 percent of the work." That's astonishing. Why isn't it 20/80?