Use two soda bottles to make a modern version of an ancient timepiece!

• 2 Clean, empty soda bottles of the same size
• 2 Bottle caps (they need to fit the bottles)
• Sand
• Awl, Hammer & Nail, or Drill (to make holes in bottle caps)
• Duct tape (or other strong tape)
• Colored water (optional)

1. Take two soda bottles of the same size (16 oz, 20 oz, 1 liter, 2 liter).
2. Make two holes in the center of each bottle cap. The holes should line up when they are put together.
3. Put sand into one of the bottles. Fill it about halfway.
4. Screw the caps onto the bottles.
5. Put the neck of the empty bottle on top of the other bottle and use the duct tape to tape them together.
6. Turn over your bottles and watch the sand run through!
7. Try using colored water instead of sand!

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