November 15

Tom says that before you go back into the past, you should check to see if there is a note! Startled, Jim looks on his desk. Sure enough, there is an envelope addressed to him! Eagerly, he tears it open and reads, ``On November 15, I, James Henle, sent myself back into the past. If you, James Henle, read this and have no memory of this event, then don't go back to the past again!'' ``You see! You did go back, and you have no memory of it!' says Tom. Jim concentrates hard.

CHALLENGE: This is one time travel experiment you can try at home! Write yourself a note just like the one Jim wrote to himself (but of course put your name on it). Seal it in an envelope, address it to yourself, and put it on your desk. Wait 10 minutes, and the look to see if there is a note for you on your desk. If there is a note, read it!

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