High Score !! 100 bad inventions in recent years

The worst invention of mankind in the 20th century was polyvinyl chloride.

On October 24, 1902, the Austrian scientist Max Schuschny invented the plastic bag, which was tantamount to a scientific and technological revolution at that time. However, to Schuschni's surprise, 100 years later, when commemorating the "100th birthday" of the plastic bag, it was rated as "the worst invention of mankind in the 20th century" by European environmental organizations. For a time, the calls for "stay away from plastic bags" and "ban plastic bags" rose higher and higher.

That's too much, it's just not entering the market.

You can't see it.

Betel nut should also be counted.

<> "Air Fryer Three Fresh.

Method:1Sauce: 1 tablespoon minced garlic, 2 tablespoons light soy sauce, 1 tablespoon dark soy sauce, 1 tablespoon oyster sauce, 1 tablespoon sugar, 1 tablespoon cornstarch, half a bowl of water, stir well.

2.The surface of the potatoes is sensitive and the surface is as sensitive as a hood, spray the bridge with oil, and bake in the air fryer at 180 degrees for 10 minutes.

3.Wrap the eggplant cubes in a layer of starch, spray some oil on the surface, and throw them into the pan for another 10 minutes.

3.Toss the green pepper cubes into the pan for another 5 minutes.

4.Pour the sauce into the wok, and after boiling, pour in the potatoes, eggplant, green oak and peppers, so that the ingredients are evenly coated with the sauce and then come out of the pan.

Homemade periscopes.

Buy two small mirrors. Make two right-angled elbow cylinders out of cardboard, slightly larger in diameter than a small mirror. Open a 45-degree oblique opening at the two right angles of the paper tube, insert the two small mirrors into the diagonal mouth (as shown in the figure), glue it with a paper strip, and put the two right-angled cylinders together with the pure reed, that is, a simple periscope.

Periscopes are used for a wide range of purposes, including in infantry trenches to observe the battle ahead, as well as in the cockpit of tanks and for gun commanders. By making a simple periscope, students can understand the reflection phenomenon of light and the principle of optical path design.

Homemade sprayers.

Production method] take a glass bottle, insert two slender glass tubes A and B on the stopper, the lower end of tube A should be stretched close to the bottom of the bottle, the upper end of the bottle is exposed, at right angles, and a rubber tube with a spring clamp is sleeved, and the other end of the rubber tube is connected to a glass tube with a pointed mouth, and the end of the bottle is connected with the injection head of the syringe with a rubber tube.

How to use] first fill the bottle with water close to the bottle mouth, so that only a small amount of air is left in the bottle, and assemble it according to Figure 5 15 12. Water is then injected into the bottle with a syringe and the plunger is kept in place, and then the spring clip is released, and the water is sprayed out of the tip of the glass tube C in a mist form.