1. You need: Two empty water bottles, sand or salt, glue and/or strong tape, cardboard, a drill or nail., First, ask an adult to use a nail or drill to make a hole right in the middle of each bottle cap.., Next, stick the caps together with glue. The tops should touch each other., After that, pour sand or salt into one water bottle, and screw two back-to-back caps on., Then, let’s screw the empty water bottle onto the other cap. , When everything is attached, use strong tape around the necks of each bottle and the caps. , For the last step, glue cardboard squares to the bottom of each bottle for stability. , Finally, turn the hourglass over and watch the sand /salt fall from the top to the bottom. .

How to make an hourglass. Put the instructions in order.

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