How to do a good job in primary school students' scientific and technological works. And a manufacturing method+material. All right. Fortune 20

1. Cut a ping-pong ball from the middle, take half for later use, mix latex with fine sand, fill it in the hemisphere, and dry it for later use.

2. Put the hard paper roll into the conical barrel and stick it firmly.

3. Fix the bottom surface of the gluing cone barrel to the cross section of the hemisphere.

4. Draw a predetermined pattern on the outside of the glued work.

Materials: table tennis, latex, fine sand, cardboard.