By Bill Anderson
Circus tightrope walkers worry about three things when they are performing. The first is the knots that hold their rope firmly above ground and keep it taunt. The second is the balance bar they use to steady their walk when things get unstable. Finally, they rely on the knowledge that the net below them is strong enough to catch them in the event of a fall. Faults in any of these three things can mean life or death for the circus performers.