What are some interesting scientific inventions, and what are some relatively simple scientific and

Can this be replaced?

1. Homemade badminton.

Prepare materials: 1 empty drink bottle, 2 foam fruit net covers, 1 rubber band, 1 glass marble.

Production process: Take a 250ml empty beverage bottle and cut off the upper part of the bottle; Do the world.

Divide the cut part into 8 equal parts, cut it to the neck of the neck with scissors, and then cut each part into the shape of petals of the same size;

Put the foam fruit net sleeve on the outside of the bottle and fix it at the mouth of the bottle with a rubber band;

Wrap another foamed fruit net around a glass marble, stuff it into the mouth of the bottle, plug it tightly and expose about 1 cm;

Cut off half of the ping pong ball, cover the bottom of the hemisphere on the mouth of the bottle, cut the four sides into a whisker, cover the mouth of the bottle and fix it with a rubber band.

After beautification and retouching, a homemade shuttlecock was completed. Hit a dozen with a badminton racket and see how it goes?

2. Homemade soap paper.

Materials and tools: white paper with good moisture absorption, small pieces of soap, a brush and disposable beverage cans.

Production method: first chop the soap and put it in the jar, put the cup on the stove after filling the appropriate amount of water, wait for the soap to melt, cut the white paper into the size of a matchbox, apply the soap liquid one by one, and then take it out to dry it to become soap paper.

3. Homemade hot air balloons.

First of all, we cut 6 to 8 leaf-shaped pieces of paper out of soft paper.

Fold them in half and glue their edges together to make a balloon.

Tape the four wires to the bottom of the balloon. Attach the other end of the thread to the table with plasticine.

Try to turn the speed of the hair dryer as slowly as possible. Aim the blower up at the bottom opening and turn the switch on. The balloon will slowly grow larger, tighten the string, and leave the table.

Fourth, homemade sun cooker.

Find a concave reflector bowl on a large flashlight, and use rigid styrofoam or wooden Kaihu to cut a cylinder about 4 cm long, with a diameter that is just right to fit into the reflector.

Drill a fine hole horizontally at one end of the cylinder, insert a wire with a diameter equivalent to the diameter of the hole, and then fold the two ends of the exposed wire into 90°, leaving 5 cm each.

Insert the cylinder into the hole in the reflector and insert the ends of the wire into a styrofoam or wooden baseplate. Sharpen the two ends of a thin bamboo skewer, insert one end into the cylinder of the reflective bowl**, and insert a small piece of potato at the other end.

Place the device in the sun so that the reflector is facing the sun, and then patiently adjust the length of the skewers so that the potatoes are in the right spotlight.

It won't be long before the potatoes are roasted in the sunlight and give off their aroma.