World renowned science fiction master
Asimov once said
"People have useless knowledge
The more, merrier animals. "
Today we will learn about ten items that seem useless
But interesting knowledge of technology
Volcanic eruption has its own "lightning" skill
When a volcano erupts, lightning sometimes forms in addition to magma. This phenomenon was discovered only about 2000 years ago. This powerful lightning phenomenon caused by a volcanic eruption is called "volcanic lightning".
So, why does lightning occur during a volcanic eruption?
On one hand, from a meteorological point of view, in a huge plume formed by a volcanic eruption, volcanic ash, rock fragments and ice crystals collide as a result of friction, generate electrical charges and are separated by gravity.
On other hand, geologists believe that electrical charge of a volcanic plume may arise from rock fragmentation, friction between volcanic ash particles, or friction between magma and a crater.
Furthermore, relevant researchers believe that "volcanic lightning" may be result of a combination of above two aspects.
In 2010, Eyjafjallajökull volcano erupted in Iceland, resulting in purple lightning streaks. Image source National Geographic
Sunflowers can absorb "gold"
Sunflowers are used as anti-nuclear symbols and signs because they absorb radioactive metal contamination and store it in their stems and leaves.
The absorption of cesium and strontium in various soil concentrations by sunflowers and distribution in different parts of sunflower were studied using pot experiments. The results showed that content of cesium in roots was higher than in other parts of plant (stems, leaves, flowers). Apart from distribution in roots, strontium was mainly transported to leaves.
Therefore, sunflower is best type of plant for cultivating large areas of soil with a low content of radioactive nuclides.
The world's first mouse was made of wood
The inventor of world's first mouse is Doug Engelbart, which is made from a wooden body and metal rollers, thus changing way people work, play and communicate in world.
Initially it was called "X-Y display system position indicator". It was birth of mouse that contributed to development of computers.
Source: "Patents Affecting World" (edited by Patent Literature Division of Patent Office of State Intellectual Property Office)
How high is electricity bill of world's fastest computer Tianhe-2
Tianhe-2 was born in a period of profound economic change, and it was also a critical period for Guangzhou to promote development of new urbanization. It is a supercomputing system developed by National University of Defense Technology, with a peak computation speed of 5.49×1016 times per second and a continuous computation speed of 3.39×1016 times per second.
It is reported that Tianhe-2 costs 100 million yuan per year for electricity alone. There are 258 machine places, which are powered by two 110,000 V substations. The construction alone cost more than 300 million yuan, and this computer cost 2.7 billion yuan...
The first virtual reality device was invented1968
Many people have heard about VR technology only in recent years, but in fact first virtual reality device was invented in 1968, and word "virtual reality" itself appeared only in 1990.
Ivan Sutherland, father of computer graphics and virtual reality, has successfully developed a helmet-mounted stereoscopic display (HMD) with a tracker. This device combines several elements of virtual reality: three-dimensional vision, performance. Create virtual screens, track head movements, create models and interact. Because equipment is so heavy that it must be hung over a person's head with a pair of robotic arms, it is called "Sword of Damocles".
Lamborghini used to make tractors
Luxury brand Lamborghini was originally a brand of tractors. Born in Italy, Ferruccio Lamborghini was a mechanic in Royal Italian Air Force as a young man, so he was very familiar with vehicle mechanics. After World War II, he started making tractors and founded Lamborghini (Lamborghini Trattori S.P.A.).
There are many theories about why Ferruccio Lamborghini founded sports car company. The most common version is this:Once Ferruccio Lamborghini and Enzo Ferrari (Enzo Ferrari) Ferrari) spoke about shortcomings of 250 GT Enzo said to Ferruccio: “There is no need for someone who produces agricultural machines and vehicles, tell me how to make sports car." explore his own sports car.
Another version, more reliable, was dictated by son of Ferruccio Lamborghini, Tonino Lamborghini. Ferruccio, who drives a Ferrari 250 GT, complained that a Ferrari car's clutch problem caused race car to lose control and accidentally injure people watching race. However, instead of ignoring this, Enzo Ferrari told Ferruccio Lamborghini that he was not capable of driving a Ferrari 250 GT and was only fit to drive agricultural vehicles. Ferruccio Lamborghini later found a suitable part and installed it in his company's warehouse to solve a problem with Ferrari 250 GT. Since then, Ferruccio Lamborghini, extremely passionate about sports cars, began to consider possibility of producing sports cars that could meet his needs. Subsequently, Lamborghini automobile plant was officially founded in 1963 and began to produce sports cars in full force.
1948 Lamborghini tractor
One degree of electricity can do a lot
It can light a table lamp for you for 40 hours, it can charge your mobile phone over 100 times, it can silently power a router for 10 days, it can power a 66W refrigerator for 15 hours. it can boil 8 kg of water.
I didn't expect one kilowatt-hour of electricity to have such a big effect, right? I encourage everyone to save energy.
Why is front of high speed rail not square, round or flat?
But bullet is same?
High-speed rail trains are also called bullet trains. The so-called bullets denote streamlined shape of front of train.
Giving head of a high-speed rail into shape of a bullet is not only for beauty, but also to solve some problems.
Because when a train is moving at high speed, one of main adversaries it faces is aerodynamics. The cross-sectional area of the two ends of "long nose" and "long tail" of high-velocity rail bullet is very small, and cross-sectional area near body slowly increases, and overall shape is streamlined. The front of car can instantly compress less air, and at same time, rear of car can release less volume at a time, so that surrounding air can be replenished quickly.
Source: Guangzhou Daily
Flea Jump SpeedSpace Shuttle
Fleas have two strong hind legs so they jump well, and since fleas have arthropod elastin on their hind legs, energy stored in it is like a spring that immediately throws flea far away.
The data show that fleas can jump up to 350 times their body length, equivalent of a human jumping across a football field, and their jumping speed is about 8 centimeters per millisecond, which exceeds maximum speed of space shuttle.
"Extreme things must be reversed"? Perfume may contain skatole
Skatol, scientific name is 3-methylindole, taste produced by high concentration 3-methylindole is classified as stinky in human sense of smell, and when diluted to a very low concentration, there will be a slight jasmine scent. As fragrance research has deepened, its special properties have been constantly developed, and it has become a member of fragrance family and one of main components of many perfumes.
Molecular formula of 3-methylindole
Source: Hefei Popular Science
August 01, 2023
August 19, 2023