static public void runTick()
        {
            Events.Add(Sim.numTicks + ": System population is " + Characters.Count + ".\n");
            int i = 0;
            Character c = Characters[i];
            while (c != null) 
            {
                try
                {
                    if (c.runTick())
                    {
                        c = Characters[++i];
                    }
                    else
                    {
                        c = Characters[i];
                    }
                }
                catch (Exception e)
                {
                    break;
                }
            }
            
            Sim.numTicks++;
        }