1. Homemade soap paper

Materials and tools:

White paper with good hygroscopicity, small piece of soap, a brush and disposable drink Can.

Preparation method:

First chop the soap and put it in a jar. Fill it with an appropriate amount of water and heat the cup on the stove. When the soap melts, cut the white paper It is about the size of a matchbox. Apply soap solution one by one, then take it out and dry it in the shade to become soap paper.

2. Homemade hot air balloon

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

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

3. Use tape to stick the four connecting wires to the bottom of the balloon. Use plasticine to secure the other end of the string to the table.

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

3. Homemade flashlight

The specific production method is: remove the lid from one end of a waste can (such as Lulu beverage can), and use a round-headed hammer to dent the other end. Use thick corrugated cardboard to roll up two AA batteries, with the positive pole facing up and the negative pole facing down, and put them into the can. Find a suitable plastic lid (such as the magic large rolled box lid that can be buckled on the Lulu beverage can), and dig a small circular hole in the center of the lid, the size of the hole is appropriate for the light bulb to be inserted tightly. Insert the bulb base into the small hole. Take a piece of hunting wire, peel off both ends of the wire, wrap one end around the lamp holder, and poke a small hole through the side of the plastic cover with the other end. Place the plastic lid on the can. Check whether the bulb and battery are in close contact. The disposable flashlight is ready here. When in use, use your thumb to press the wire coming out of the side wall onto the paint-free weld of the can, and the flashlight will glow. If your thumb leaves the wire and jumps up, the flashlight will go out. It is very convenient to use.

4. Homemade solar cooker

Find a concave reflective bowl on a large flashlight, and use rigid foam plastic or wood to cut a cylinder about 4 cm long and 1 in diameter. It should fit tightly into the round hole of the reflective bowl. Drill a thin hole transversely at one end of the cylinder, insert an iron wire with a diameter equal to the diameter of the hole, and then bend the two ends of the exposed iron wire at 90°, leaving 5 cm on each side. Insert the cylinder into the round hole of the reflective bowl, and then insert both ends of the wire into a foam plastic or wooden base. Sharpen both ends of a thin bamboo stick, insert one end into the cylinder in the center of the reflective bowl, and insert a small piece of potato into the other end. Place the device in the sun, with the reflective bowl facing the sun, and then patiently adjust the length of the bamboo stick so that the inserted potato is exactly at the focus of the light. Before long, the potatoes will be roasted by the sun and give off a fragrant aroma.