First take two identical empty beverage bottles and fill them with a little sand. Next, poke a few small holes in the caps of the two bottles with a nail in alignment, and then connect the tops of the two bottles and tie them together with transparent tape so that the sand will flow down the small holes in the tops of the bottles and into the other bottle. Note that the speed at which the sand flows depends on the size of the holes made in the two bottle caps.

Additions:

Preparation materials: two beverage bottles (only one cap), fine sand, instant stickers, tape, scissors, cardboard

Production process: (1) Remove the outer packaging of the beverage bottles, brush the bottles clean and empty the water dry.

(2) Cut the stickers into various shapes with scissors and paste them on the empty bottles to make the bottles look beautiful. \

(3) Use small scissors to cut a big hole in the mouth of one bottle cap.

(4) Fill the beverage bottles halfway with fine sand.

(5) Join the mouths of the two beverage bottles and seal them with tape.

(6) Finally, cut the cardboard to the width of the two bottles and seal it with tape.

A beautiful hourglass is ready. Please give it a try!