## THEaiw of tiie Mind

.Next die performer introduces a stop watch, set at zero, iliis is handed to one of the seated spectators. 7 have banded thisgentletnan a stop-watch, so that he can time the next parr of dye exf>criment. Vm going over to the blackboard and will write down four five-digit numbers. J uant you. sir, to start the watch its soon as I begin to write, and to stop it w*>en / tell you to. I will say go wlyen you are to start the watch." • . \ - .

He walks to the blackboard and, after shouting, *Go, "begins to write four rows of five figures. The actual figures will vary from show to show, but for the sake of clarity, we will assume rhey arc these:

 1 A* 4 6 9 6 3 9 • 2 6 0.5 4 1 6 2 7 4 7 1 5 0

A great show is made of writing these figures a* rapidly as possible, and die performer shouts, "Stop!"as soon as the final figure is written.

ltf\roui how long did that take? "About twenty seconds is usuaily rhe answer.

11 Very good! 1 will now add dre figures "Doing so, he produces a total of 152,738 in this instance. (A pocket calculator may be given to someone to verify the addition.)

Turning to the spectators, he says. "U7\$you please stand up. Now, starting with the gentleman on the endy will you each call out the number you are thinking of and as you do so, sit down, domino fashion!" They do this, and the numbers thev call out arc:

0 0