What are some designs that seem complicated and useless, but are actually very powerful?

Speaking of stupid-looking designs, I have to talk about CCTV's "I Love Invention" column. The plot will have an ordinary person inventing for the convenience of work and life. Every time an invention is successful, some experiments are carried out, and when the inventor thinks he is perfect, he arranges a competition, and then loses, improves, compares, loses, and improves.

Until no one else wants to waste any more time competing, and then come up with the final result, and beg for the last time. In this last battle, I finally won (there were some small surprises from time to time during the game)! Congratulations, congratulations.

Then get the approval of others, or sign some contracts on the spot. At the end of the day, a professor from a certain university will be invited to comment on what principles are used in this invention and how ingenious it is. I watched several episodes in the same way, and all kinds of places are slots.

It doesn't feel more boring than that.

Coke, Sprite, iced tea bottles have such a notch, the spiral is not connected, and there is also a notch in the corresponding position on the cap, why is there such a design? Why? This is because carbonated drinks are injected with a certain amount of carbon dioxide, and these gaps have a function, that is, in the process of opening the cap, the gas in the bottle leaks out quickly through this gap, otherwise at the last moment of unscrewing, the residual gas pressure will shoot the cap out like a cannonball, scaring the person to death.

Soda bottles with a notched mouth After the cap is unscrewed, the gas is released from the notch, and the cap will not pop out because the cap thread is stuck at the mouth of the bottle, and consumers can easily unscrew the cap to drink delicious drinks.

Every time you recharge your bus card, you hand the money and card through the recharge window, and the waiter will first raise your hand to light your palm to you, and then take your money and card. When the bus card is recharged, the attendant will hand you the bus card and receipt through the window, and then raise his hand to show you. Raise your hand for the first time and tell you that her hand is empty, and there will be no exchange of fake money for your money.

Raise your hand for the second time and tell you that her hand is empty, and there will be no exchange of an empty bus card for your charged bus card. Two simple actions, how many disputes have been avoided. It also stifles the possibility of a handful of unscrupulous people making money at the recharge window of the subway station.

High school physics competition training, in the physics building of Peking University, there is a toilet in the building, the front and back of the door are written "pull", in fact, the door can indeed be opened from both sides, at first my classmates and I thought that the decoration of the person mentally retarded was written wrong. Until one day, when I was trying to go to the bathroom, I was hit in the nose by the door pushed open by someone coming out of the room. At that moment, I realized what a humane design it was.

The self-service ticket exchange machine at the railway station (Beijing) has an inclination where the ID card is placed. It seems a little inconvenient, and if you don't hold the ID card with your hand, you will slide down and you can't read the card smoothly. The highlight is to prompt the user to take away the ID card, just imagine if it is a flat place to put the card, a person who catches the train is in a hurry to change the ticket, look at the watch, it is going to be late, and leave in a hurry.

As a result, the card fell.

God design, hair: attributes, disorganized, complicated and useless, use, used in medical hoof tissue cutting surgery, make an important contribution to medicine, can be cut and regenerated, hair dyeing tests people's infinite reverie about color, black and white reveals the connotation of Tai Chi philosophy.