YOU CAN DO THIS EXPERIMENT AT YOUR HOME TO THRILL YOUR FRIENDS AND FAMILY MEMBERS.
YOU WILL NEED:  A CYLINDRICAL TABLET BOX WITH LID,  A STRIP OF USED CYCLE TUBE,  A GEM CLIP, SMALL WEIGHT SUCH AS NUT etc, AND  TWO PAPER PINS.
MAKE SLITS AT THE BOTTOM AND TOP OF THE TABLET BOX SUCH THAT THE STRIP OF CYCLE TUBE ENTERS ON BOTH THE SIDES.  REMOVE THE LID AND WITH THE HELP OF THE GEM CLIP HANG THE SMALL WEIGHT BY STRETCHING THE GEM CLIP AND FIXING THE GEM CLIP AT THE CENTRE OF THE CYCLE TUBE HORIZONTAL TO THE TABLET BOX.  FIX THE PAPER PINS TO THE CYCLE TUBE ONE ON EACH SIDE.  NOW IF YOU ROLL THE TABLET BOX ON THE SMOOTH GROUND SURFACE HORIZONTALLY, YOU WILL BE ASTONISHED TO FIND THAT THE  BOX WILL COME BACK. IS IT NOT FUN?  SO DO IT ATONCE.
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